Smooth Follow Camera... - GameCreators Forum

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Ninja_Je5us

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Joined: 1st Feb 2010

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Posted: 19th Nov 2010 18:57

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Hi,

I am building a 3D flying game using a jet fighter and would like to have a camera that follows the object. I have tried, unsuccessfully, to use the command dbSetCameraToFollow but it's not as smooth as I would like.

I have the jet moving perfectly, it is able to roll right and left, turn right and left (which involves a degree of roll as well as it looks more realistic), it can pitch up and down and moves in any direction using the space key.

Actually there's another question to do with the pitching of the plane. I want it to not be able pitch further than 90 degrees either way. Is that possible?

Any help is much appreciated.

Here's my code, please ignore anything commented out, i've tried on many occasions to make myself a smooth camera.

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	dbSetDisplayMode(1280, 800, 32);
	
	dbSyncOn   ( );
	dbSyncRate ( 60 );

/*dbSetCameraRange(1.0f, 30000.0f);

dbLoadImage("Image4.jpg",2);
	dbLoadImage("Image5.jpg",3);*/
	
	float planePosX;
	float planePosY;
	float planePosZ;

float cameraPosX;
	float cameraPosY;
	float cameraPosZ;

float cameraAngleX;
	float cameraAngleY;
	float cameraAngleZ;

planePosX = 0;
	planePosY = 0;
	planePosZ = 0;
	
	cameraPosX = planePosX;
	cameraPosY = planePosY + 10;
	cameraPosZ = planePosZ - 30;

dbLoadObject( "H-Jet Fighter-Move.x" ,1 );
	dbPositionObject(1,planePosX,planePosY,planePosZ);
	//dbPositionCamera(0,10,-30);
	dbRotateObject(1,0,180,0);

dbLoopObject(1,1,1);
	dbSetObjectSpeed(1,2);

dbPositionCamera(cameraPosX, cameraPosY, cameraPosZ);
	/*dbRotateCamera(cameraAngleX, cameraAngleY, cameraAngleZ);*/

/*dbSetupTerrain();
	dbMakeObjectTerrain(100);
	dbSetTerrainHeightMap(100, "Image3.jpg");
	dbSetTerrainScale(100,10,0.4,10);
	dbSetTerrainLight(100, 1.0f, -0.25f, 0.0f, 1.0f, 1.0f, 0.78f, 0.2f);
	dbSetTerrainTexture(100,2,3);
	dbBuildTerrain(100);

dbLoadObject("skybox2.x",4);
	dbSetObjectLight(4,0);
	dbScaleObject(4, 30000, 30000, 30000);*/

while ( LoopGDK ( ) )
	{
		if(dbShiftKey()==1)
		{
			if(dbKeyState(44)==1)
			{
				dbRollObjectRight(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
		
			}
		} else if(dbKeyState(44)==1)
		{
			dbRollObjectRight(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
		
		}

if(dbShiftKey()==1)
		{
			if(dbKeyState(45)==1)
			{
				dbRollObjectLeft(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/

}
		} else if(dbKeyState(45)==1)
		{
			dbRollObjectLeft(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
		}

if(dbShiftKey()==1)
		{
			if(dbLeftKey()==1)
			{
				dbRollObjectRight(1,1);
				dbTurnObjectLeft(1,2);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
		
			}
		} else if(dbLeftKey()==1)
		{
			dbRollObjectRight(1,3);
			dbTurnObjectLeft(1,5);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
			
		}

if(dbShiftKey()==1)
		{
			if(dbRightKey()==1)
			{
				dbRollObjectLeft(1,1);
				dbTurnObjectRight(1,2);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
			}
		} else if(dbRightKey()==1)
		{
			dbRollObjectLeft(1,3);
			dbTurnObjectRight(1,5);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/

}

if(dbShiftKey()==1)
		{
			if(dbDownKey()==1)
			{
				dbPitchObjectDown(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
				
			}
		} else if(dbDownKey()==1)
		{
			dbPitchObjectDown(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/

}

if(dbShiftKey()==1)
		{
			if(dbUpKey()==1)
			{
				dbPitchObjectUp(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
				
			}
		} else if(dbUpKey()==1)
		{
			dbPitchObjectUp(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
		}

if(dbSpaceKey()==1)
		{
			dbMoveObject(1,-1);
			dbPlayObject(1);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
				
			
		}

dbSync ( );
	}

return;
}

+ Code Snippet

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	dbSetDisplayMode(1280, 800, 32);
	
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	/*dbSetCameraRange(1.0f, 30000.0f);

	dbLoadImage("Image4.jpg",2);
	dbLoadImage("Image5.jpg",3);*/
	
	float planePosX;
	float planePosY;
	float planePosZ;

	float cameraPosX;
	float cameraPosY;
	float cameraPosZ;

	float cameraAngleX;
	float cameraAngleY;
	float cameraAngleZ;

	planePosX = 0;
	planePosY = 0;
	planePosZ = 0;
	
	cameraPosX = planePosX;
	cameraPosY = planePosY + 10;
	cameraPosZ = planePosZ - 30;

	dbLoadObject( "H-Jet Fighter-Move.x" ,1 );
	dbPositionObject(1,planePosX,planePosY,planePosZ);
	//dbPositionCamera(0,10,-30);
	dbRotateObject(1,0,180,0);

	dbLoopObject(1,1,1);
	dbSetObjectSpeed(1,2);

	
	dbPositionCamera(cameraPosX, cameraPosY, cameraPosZ);
	/*dbRotateCamera(cameraAngleX, cameraAngleY, cameraAngleZ);*/
	
	

	/*dbSetupTerrain();
	dbMakeObjectTerrain(100);
	dbSetTerrainHeightMap(100, "Image3.jpg");
	dbSetTerrainScale(100,10,0.4,10);
	dbSetTerrainLight(100, 1.0f, -0.25f, 0.0f, 1.0f, 1.0f, 0.78f, 0.2f);
	dbSetTerrainTexture(100,2,3);
	dbBuildTerrain(100);

	dbLoadObject("skybox2.x",4);
	dbSetObjectLight(4,0);
	dbScaleObject(4, 30000, 30000, 30000);*/
	

	while ( LoopGDK ( ) )
	{
		if(dbShiftKey()==1)
		{
			if(dbKeyState(44)==1)
			{
				dbRollObjectRight(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
		
			}
		} else if(dbKeyState(44)==1)
		{
			dbRollObjectRight(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
		
		}

		if(dbShiftKey()==1)
		{
			if(dbKeyState(45)==1)
			{
				dbRollObjectLeft(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/

			}
		} else if(dbKeyState(45)==1)
		{
			dbRollObjectLeft(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
		}

		if(dbShiftKey()==1)
		{
			if(dbLeftKey()==1)
			{
				dbRollObjectRight(1,1);
				dbTurnObjectLeft(1,2);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
		
			}
		} else if(dbLeftKey()==1)
		{
			dbRollObjectRight(1,3);
			dbTurnObjectLeft(1,5);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
			
		}

		if(dbShiftKey()==1)
		{
			if(dbRightKey()==1)
			{
				dbRollObjectLeft(1,1);
				dbTurnObjectRight(1,2);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
			}
		} else if(dbRightKey()==1)
		{
			dbRollObjectLeft(1,3);
			dbTurnObjectRight(1,5);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/

		}

		if(dbShiftKey()==1)
		{
			if(dbDownKey()==1)
			{
				dbPitchObjectDown(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
				
			}
		} else if(dbDownKey()==1)
		{
			dbPitchObjectDown(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/

		}

		if(dbShiftKey()==1)
		{
			if(dbUpKey()==1)
			{
				dbPitchObjectUp(1,1);
				/*planePosX = dbObjectPositionX(1);
				planePosY = dbObjectPositionY(1);
				planePosZ = dbObjectPositionZ(1);*/
				
			}
		} else if(dbUpKey()==1)
		{
			dbPitchObjectUp(1,3);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
		}

		if(dbSpaceKey()==1)
		{
			dbMoveObject(1,-1);
			dbPlayObject(1);
			/*planePosX = dbObjectPositionX(1);
			planePosY = dbObjectPositionY(1);
			planePosZ = dbObjectPositionZ(1);*/
				
			
		} 
		

		dbSync ( );
	}

	
	return;
}

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Dodga

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Joined: 12th Dec 2009

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Posted: 20th Nov 2010 08:31

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For the follow camera, an extremely simple way to move the camera would be something like

dbPositionCamera(dbObjectPositionX(1), dbObjectPositionY(1), dbObjectPositionZ(1));
dbSetCameraToObjectOrientation(1);
dbMoveCamera(-50);
dbMoveCameraUp(20);
dbPointCamera(dbObjectPositionX(1), dbObjectPositionY(1), dbObjectPositionZ(1));

There are easier ways that use triginometry but this is simpler to understand for a beginner.

To limit the roll you could do something like

if(dbObjectAngleZ(1)<90)
{
roll code
}

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Ninja_Je5us

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Joined: 1st Feb 2010

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Posted: 21st Nov 2010 21:34

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Hi, thanks for your reply. I tried both of these things and unfortunately have managed to get neither to work. I started by putting everything as you have and it brought up an error because it wanted the "dbMoveCameraUp" function to take two arguments rather than one. Once I fixed this issue (probably wrongly) the camera ended up in front of the plane, whatever rotation I applied to the plane and didnt move with it.

I am working on the pitching issue but thats not a major problem for me at the moment.

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DeadTomGC

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Posted: 22nd Nov 2010 02:48 Edited at: 22nd Nov 2010 15:30

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Hey, I made some code that operates a smooth following, 3rd person style camera, and I made a smooth following camera for somebody else's flying game. I'm not completely sure that the second one works, though. The first one uses a little complicated trig, but I could explain it if you want.

First:

+ Code Snippet

dbPositionCamera(dbObjectPositionX(2)-5*dbCos(dbCameraAngleX())*dbSin(dbCameraAngleY()),dbObjectPositionY(2)+5*dbSin(dbCameraAngleX()),dbObjectPositionZ(2)-5*dbCos(dbCameraAngleX())*dbCos(dbCameraAngleY()));

The 5's are the distance from the object(2) to the camera. If this line is put after a line that determines the rotation of the camera(Try This:

+ Code Snippet

dbRotateCamera(dbObjectAngleX(3),dbObjectAngleY(3),dbObjectAngleZ(3));

)[, you will be able to control the camera's movement and angle
while still having the camera remain in orbit about the object and always face the object. Of course, looking left will cause the camera to move right.

Second:

+ Code Snippet

dbRotateCamera(dbObjectAngleX(3),dbObjectAngleY(3),dbObjectAngleZ(3));
dbMoveObject(3,-20);
		dbPositionCamera(dbObjectPositionX(3),dbObjectPositionY(3),dbObjectPositionZ(3));
		
		dbMoveObject(3,21);

I think this will make your camera follow the object(3) 20 units back and always look forward, while it also moves the object(3) forward at a speed of one unit/refresh. Note, if your object flys backward you should use this:

+ Code Snippet

dbRotateCamera(dbObjectAngleX(3),dbObjectAngleY(3)+180,dbObjectAngleZ(3));
dbMoveObject(3,20);
		dbPositionCamera(dbObjectPositionX(3),dbObjectPositionY(3),dbObjectPositionZ(3));
		
		dbMoveObject(3,-21);

Let me know if you have any questions.
Edit:
Here is some code that lets you control the angle and orientaion of the camera using an xbox 360 contoller.

+ Code Snippet

//above while
	float cry=0;
float crx=0;
float cr=0;
cr=32767;
float dist=10;
//in while
	if(dbAbs(dbJoystickTwistY ( )-cr)<4205){

cry=cr;

		}else{
cry=dbJoystickTwistY ( );

		}
	if(dbAbs(dbJoystickTwistX ( )-cr)<4205){

crx=cr;

		}else{
crx=dbJoystickTwistX ( );

		}
		dbRotateCamera(dbCameraAngleX()+cry *.0001-cr*.0001,dbCameraAngleY()+crx *.0001-cr*.0001,dbCameraAngleZ());
//dbRotateCamera(dbObjectAngleX(2),dbObjectAngleY(2)+180,0);
		dbPositionCamera(dbObjectPositionX(3)-dist*dbCos(dbCameraAngleX())*dbSin(dbCameraAngleY()),dbObjectPositionY(3)+dist*dbSin(dbCameraAngleX()),dbObjectPositionZ(3)-dist*dbCos(dbCameraAngleX())*dbCos(dbCameraAngleY()));

uuhh... yah...

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Dodga

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Posted: 22nd Nov 2010 07:52 Edited at: 22nd Nov 2010 07:53

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Ninja_Je5us

Quote: "
Hi, thanks for your reply. I tried both of these things and unfortunately have managed to get neither to work. I started by putting everything as you have and it brought up an error because it wanted the "dbMoveCameraUp" function to take two arguments rather than one. Once I fixed this issue (probably wrongly) the camera ended up in front of the plane, whatever rotation I applied to the plane and didnt move with it.

I am working on the pitching issue but thats not a major problem for me at the moment. "

That weird, usually you can just use one arg and it does it for the active camera. Try this:

+ Code Snippet

dbPositionCamera(0, dbObjectPositionX(1), dbObjectPositionY(1), dbObjectPositionZ(1));
dbSetCameraToObjectOrientation(0, 1);
dbMoveCamera(0, -50);
dbMoveCameraUp(0, 20);
dbPointCamera(0, dbObjectPositionX(1), dbObjectPositionY(1), dbObjectPositionZ(1));

Also, you have to call the code every loop, so put this code in the beginning of the while() section

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Ninja_Je5us

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Posted: 22nd Nov 2010 23:11

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Thanks for all of your replies.

Deadtom, I am trying your second method. It works in terms of positioning the camera and with a small tweak (namely putting a line saying dbMoveCamera(3) when the space bar is pressed and the model moves) it moves with the model, however if the plane pitches or turns it does not follow the model. I will post my code and you can have a look.

Any help is greatly appreciated

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple 3D project that uses Dark GDK
// it can be used as a starting point in making your own 3D games

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	
	dbSyncOn();
	dbSyncRate( 60 );
	dbSetDisplayMode(1280, 800, 32);

bool highSpeed;
	highSpeed = 0;

dbLoadObject( "H-Jet Fighter-Move.x", 1 );
	dbPositionObject( 1, 0, 0, 0 );
	dbRotateObject( 1, 0, 180, 0 );
	dbLoopObject( 1, 1, 1 );
	dbSetObjectSpeed( 1, 2 );

dbLoadObject( "skybox2.x", 2 );
	dbPositionObject( 2, 0, 0, 0 );
	dbSetObjectLight( 2, 0 );
	dbScaleObject( 2, 30000, 30000, 30000 );

dbPositionCamera( 0, 10, -30 );
	dbRotateCamera(dbObjectAngleX(1), dbObjectAngleY(1)+180, dbObjectAngleZ(1));
		dbMoveObject(1, 20);
			dbPositionCamera(dbObjectPositionX(1), dbObjectPositionY(1)+5, dbObjectPositionZ(1)-20);
			dbMoveObject(1, -21);

while ( LoopGDK ( ) )
	{

if(dbShiftKey()==1)
		{
			if(dbKeyState(44)==1)
			{
				dbRollObjectRight(1,1);
			}
		} else if(dbKeyState(44)==1)
		{
			dbRollObjectRight(1,3);
		}

if(dbShiftKey()==1)
		{
			if(dbKeyState(45)==1)
			{
				dbRollObjectLeft(1,1);
			}			
		} else if(dbKeyState(45)==1)
			{
				dbRollObjectLeft(1,3);
			}

if(dbShiftKey()==1)
		{
			if(dbLeftKey()==1)
			{
				dbRollObjectRight(1,1);
				dbTurnObjectLeft(1,2);
			}
		} else if(dbLeftKey()==1)
			{
				dbRollObjectRight(1,3);
				dbTurnObjectLeft(1,5);
			}

if(dbShiftKey()==1)
		{
			if(dbRightKey()==1)
			{
				dbRollObjectLeft(1,1);
				dbTurnObjectRight(1,2);
			}
		} else if(dbRightKey()==1)
			{
				dbRollObjectLeft(1,3);
				dbTurnObjectRight(1,5);
			}

if(dbShiftKey()==1)
		{
			if(dbDownKey()==1)
			{
				dbPitchObjectDown(1,1);
			}
		} else if(dbDownKey()==1)
			{
				dbPitchObjectDown(1,3);
			}

if(dbShiftKey()==1)
		{
			if(dbUpKey()==1)
			{
				dbPitchObjectUp(1,1);
			}
		} else if(dbUpKey()==1)
		{
			dbPitchObjectUp(1,3);
		}

if(dbKeyState(46)==1)
		{
			if(highSpeed==0)
			{
				highSpeed = 1;
			} else
			{
				highSpeed = 0;
			}
		}

if(dbSpaceKey()==1)
		{
			if(highSpeed==0)
			{
				dbMoveObject(1,-1);
				dbPlayObject(1);
			} else 
			{
				dbMoveObject(1,-3);
			}
		}

dbSync ( );
	}

return;
}

+ Code Snippet


// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple 3D project that uses Dark GDK
// it can be used as a starting point in making your own 3D games

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	
	dbSyncOn();
	dbSyncRate( 60 );
	dbSetDisplayMode(1280, 800, 32);

	bool highSpeed;
	highSpeed = 0;

	dbLoadObject( "H-Jet Fighter-Move.x", 1 );
	dbPositionObject( 1, 0, 0, 0 );
	dbRotateObject( 1, 0, 180, 0 );
	dbLoopObject( 1, 1, 1 );
	dbSetObjectSpeed( 1, 2 );

	dbLoadObject( "skybox2.x", 2 );
	dbPositionObject( 2, 0, 0, 0 );
	dbSetObjectLight( 2, 0 );
	dbScaleObject( 2, 30000, 30000, 30000 );

	dbPositionCamera( 0, 10, -30 );
	dbRotateCamera(dbObjectAngleX(1), dbObjectAngleY(1)+180, dbObjectAngleZ(1));
		dbMoveObject(1, 20);
			dbPositionCamera(dbObjectPositionX(1), dbObjectPositionY(1)+5, dbObjectPositionZ(1)-20);
			dbMoveObject(1, -21);

	while ( LoopGDK ( ) )
	{

		if(dbShiftKey()==1)
		{
			if(dbKeyState(44)==1)
			{
				dbRollObjectRight(1,1);
			}
		} else if(dbKeyState(44)==1)
		{
			dbRollObjectRight(1,3);
		}

		if(dbShiftKey()==1)
		{
			if(dbKeyState(45)==1)
			{
				dbRollObjectLeft(1,1);
			}			
		} else if(dbKeyState(45)==1)
			{
				dbRollObjectLeft(1,3);
			}

		if(dbShiftKey()==1)
		{
			if(dbLeftKey()==1)
			{
				dbRollObjectRight(1,1);
				dbTurnObjectLeft(1,2);
			}
		} else if(dbLeftKey()==1)
			{
				dbRollObjectRight(1,3);
				dbTurnObjectLeft(1,5);
			}

		if(dbShiftKey()==1)
		{
			if(dbRightKey()==1)
			{
				dbRollObjectLeft(1,1);
				dbTurnObjectRight(1,2);
			}
		} else if(dbRightKey()==1)
			{
				dbRollObjectLeft(1,3);
				dbTurnObjectRight(1,5);
			}

		if(dbShiftKey()==1)
		{
			if(dbDownKey()==1)
			{
				dbPitchObjectDown(1,1);
			}
		} else if(dbDownKey()==1)
			{
				dbPitchObjectDown(1,3);
			}

		if(dbShiftKey()==1)
		{
			if(dbUpKey()==1)
			{
				dbPitchObjectUp(1,1);
			}
		} else if(dbUpKey()==1)
		{
			dbPitchObjectUp(1,3);
		}

		if(dbKeyState(46)==1)
		{
			if(highSpeed==0)
			{
				highSpeed = 1;
			} else
			{
				highSpeed = 0;
			}
		}

		if(dbSpaceKey()==1)
		{
			if(highSpeed==0)
			{
				dbMoveObject(1,-1);
				dbPlayObject(1);
			} else 
			{
				dbMoveObject(1,-3);
			}
		}
				

		dbSync ( );
	}

	return;
}

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Ninja_Je5us

14

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Joined: 1st Feb 2010

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Posted: 23rd Nov 2010 17:27

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Sorry a bit of progress. I've managed to make the dbSetCameraToFollow command to follow the model, however I need to make the camera rotate when the plane does.

Im going to try pointing the camera and a couple of things.

Any ideas would be appreciated.

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Ninja_Je5us

14

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Joined: 1st Feb 2010

Location:

Posted: 23rd Nov 2010 17:58

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Hi,

Sorry to post again but I have managed to make it work to a standard that I am more than happy with.

Thank you very much for the help that you have all given me

And on to the next problem!

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DeadTomGC

13

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Joined: 11th Aug 2010

Location: LU

Posted: 29th Nov 2010 00:51

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Sorry I did not respond to your other posts. I did not have any internet for a few days. This was the final code that should toggle between gliding about the object and remaining behind it by pressing the shift key.

#include "DarkGDK.h"

//global vars
float rolla=0;
	float cry=0;
float crx=0;
float cr=32767;

float dist=10; //distance the camera is from the plane
float rvx=0;
	float rvy=0;
	bool shift=false;
	bool move=false;
	void camandplanex(void);
void DarkGDK ( void )
{
	// entry point for the application

// switch on sync rate and set to a maximum of 60 fps
	dbSyncOn ( );
	dbSyncRate ( 60 );
	//dbSetDisplayMode (800, 600, 32);

//Camera Settings
	//dbMakeCamera(100);
	//dbPositionCamera(100,1900,3000,1900);
	//dbRotateCamera (100,90,0,0); 
//dbSetObjectRotationXYZ ( 3 ) ;
///dbSetCameraRotationXYZ ( 100) ;

//Object Settings
	dbLoadObject("H-Jet Fighter 2-Move.x", 3);
	dbLoadImage("JetFigh2.dds", 4);
	dbTextureObject(3,4);
	//dbPositionObject(3,0,100,-50);
	//dbRotateObject(3,0,180,0);
	//dbPlayObject(3,0,3);
	//dbSetObjectSpeed(1,10);
	float angy=dbObjectAngleY(3);
	float angx=dbObjectAngleX(3);
	float angz=dbObjectAngleZ(3);

while ( LoopGDK ( ) ){
	
		
//This requires an xbox 360 controller
	camandplanex();

if ( dbEscapeKey ( ) ){
			break;
		}
		
		dbSync ( );
}

return;
}

void camandplanex(void){

if(rvx>0){
		rvx=rvx-.2;
		if(rvx<0)
			rvx=0;
		}else{
rvx=rvx+.2;
		if(rvx>0)
			rvx=0;
		}
		
		
		if(rvy>0){
		rvy=rvy-.2;
		if(rvy<0)
			rvy=0;
		}else{
rvy=rvy+.2;
		if(rvy>0)
			rvy=0;
		}
		// responds to the left stick
		if ( dbJoystickY ()<-500){ 
			if(rvx>-2 ){
			rvx=rvx-.25;
			}else{rvx=-2;}
		}
		// 
		if ( dbJoystickY ()>500){ 
			if(rvx<+2){
			rvx=rvx+.25;
		    }else{rvx=2;}
		}
		if ( dbJoystickX ()<-500){ 
			if(rvy>-2 ){
			rvy=rvy-.25;
			}else{rvy=-2;}
		}
		// 
		if ( dbJoystickX ()>500){  
			if(rvy<+2){
			rvy=rvy+.25;
			}else{rvy=2;}
		}	
if ( dbUpKey()){ 
			if(rvx>-2 ){
			rvx=rvx-.25;
			}else{rvx=-2;}
		}
		// 
		if ( dbDownKey()){ 
			if(rvx<+2){
			rvx=rvx+.25;
		    }else{rvx=2;}
		}
		if ( dbLeftKey()){ 
			if(rvy>-2 ){
			rvy=rvy-.25;
			}else{rvy=-2;}
		}
		// 
		if ( dbRightKey()){  
			if(rvy<+2){
			rvy=rvy+.25;
			}else{rvy=2;}
		}	
		//rotates and moves the plane
		dbRollObjectRight(3,-rvy);
	
dbPitchObjectDown ( 3, rvx );
	dbMoveObject(3,-1);
	
		//responds to the right stick
	/////////this code is only used when the camera is set to move freely about the object, but it does not need to be suspended
		if(dbAbs(dbJoystickTwistY ( )-cr)<4205){

cry=cr;

}else{
cry=dbJoystickTwistY ( );

}
	if(dbAbs(dbJoystickTwistX ( )-cr)<4205){

crx=cr;

}else{
crx=dbJoystickTwistX ( );

}
//suspend this to enable full xbox controller use.//
	crx=dbMouseMoveX()*1000.+cr;
	cry=dbMouseMoveY()*1000.+cr;
		/////////////////////

/////////////////////
	if(dbShiftKey()){
	if(shift==false){
		if(move==true){
move=false;
		}else{
move=true;

}
	}
	shift=true;
	}else{
shift=false;
	}

if(move==false){
//////this code positions the camera behind the plane
	dbSetCameraToObjectOrientation(3);
dbPitchCameraDown ( 180-15 );
dbRollCameraRight(180);
dbPositionCamera(dbObjectPositionX(3),dbObjectPositionY(3),dbObjectPositionZ(3));
dbMoveCamera(-dist);
dbPitchCameraDown ( -15 );
		}else{
///this allows the camera to move freely about the plane
			
		dbRotateCamera(dbCameraAngleX()+cry *.0001-cr*.0001,dbCameraAngleY()+crx *.0001-cr*.0001,0);
		dbPositionCamera(dbObjectPositionX(3)-dist*dbCos(dbCameraAngleX())*dbSin(dbCameraAngleY()),dbObjectPositionY(3)+dist*dbSin(dbCameraAngleX()),dbObjectPositionZ(3)-dist*dbCos(dbCameraAngleX())*dbCos(dbCameraAngleY()));
		}

}

+ Code Snippet

#include "DarkGDK.h"
 

//global vars
float rolla=0;
	float cry=0;
float crx=0;
float cr=32767;

float dist=10; //distance the camera is from the plane
float rvx=0;
	float rvy=0;
	bool shift=false;
	bool move=false;
	void camandplanex(void);
void DarkGDK ( void )
{
	// entry point for the application

	// switch on sync rate and set to a maximum of 60 fps
	dbSyncOn ( );
	dbSyncRate ( 60 );
	//dbSetDisplayMode (800, 600, 32);

	//Camera Settings
	//dbMakeCamera(100);
	//dbPositionCamera(100,1900,3000,1900);
	//dbRotateCamera (100,90,0,0); 
//dbSetObjectRotationXYZ ( 3 ) ;
///dbSetCameraRotationXYZ ( 100) ;

	//Object Settings
	dbLoadObject("H-Jet Fighter 2-Move.x", 3);
	dbLoadImage("JetFigh2.dds", 4);
	dbTextureObject(3,4);
	//dbPositionObject(3,0,100,-50);
	//dbRotateObject(3,0,180,0);
	//dbPlayObject(3,0,3);
	//dbSetObjectSpeed(1,10);
	float angy=dbObjectAngleY(3);
	float angx=dbObjectAngleX(3);
	float angz=dbObjectAngleZ(3);
 
	

while ( LoopGDK ( ) ){
	
		
//This requires an xbox 360 controller
	camandplanex();	
		



if ( dbEscapeKey ( ) ){
			break;
		}
		
		dbSync ( );
}



return;
}

void camandplanex(void){

if(rvx>0){
		rvx=rvx-.2;
		if(rvx<0)
			rvx=0;
		}else{
rvx=rvx+.2;
		if(rvx>0)
			rvx=0;
		}
		
		
		if(rvy>0){
		rvy=rvy-.2;
		if(rvy<0)
			rvy=0;
		}else{
rvy=rvy+.2;
		if(rvy>0)
			rvy=0;
		}
		// responds to the left stick
		if ( dbJoystickY ()<-500){ 
			if(rvx>-2 ){
			rvx=rvx-.25;
			}else{rvx=-2;}
		}
		// 
		if ( dbJoystickY ()>500){ 
			if(rvx<+2){
			rvx=rvx+.25;
		    }else{rvx=2;}
		}
		if ( dbJoystickX ()<-500){ 
			if(rvy>-2 ){
			rvy=rvy-.25;
			}else{rvy=-2;}
		}
		// 
		if ( dbJoystickX ()>500){  
			if(rvy<+2){
			rvy=rvy+.25;
			}else{rvy=2;}
		}	
if ( dbUpKey()){ 
			if(rvx>-2 ){
			rvx=rvx-.25;
			}else{rvx=-2;}
		}
		// 
		if ( dbDownKey()){ 
			if(rvx<+2){
			rvx=rvx+.25;
		    }else{rvx=2;}
		}
		if ( dbLeftKey()){ 
			if(rvy>-2 ){
			rvy=rvy-.25;
			}else{rvy=-2;}
		}
		// 
		if ( dbRightKey()){  
			if(rvy<+2){
			rvy=rvy+.25;
			}else{rvy=2;}
		}	
		//rotates and moves the plane
		dbRollObjectRight(3,-rvy);
	
dbPitchObjectDown ( 3, rvx );
	dbMoveObject(3,-1);
	
		//responds to the right stick
	/////////this code is only used when the camera is set to move freely about the object, but it does not need to be suspended
		if(dbAbs(dbJoystickTwistY ( )-cr)<4205){

cry=cr;

		}else{
cry=dbJoystickTwistY ( );

		}
	if(dbAbs(dbJoystickTwistX ( )-cr)<4205){

crx=cr;

		}else{
crx=dbJoystickTwistX ( );

		}
//suspend this to enable full xbox controller use.//
	crx=dbMouseMoveX()*1000.+cr;
	cry=dbMouseMoveY()*1000.+cr;
		/////////////////////

	/////////////////////
	if(dbShiftKey()){
	if(shift==false){
		if(move==true){
move=false;
		}else{
move=true;

		}
	}
	shift=true;
	}else{
shift=false;
	}


	if(move==false){
//////this code positions the camera behind the plane
	dbSetCameraToObjectOrientation(3);
dbPitchCameraDown ( 180-15 );
dbRollCameraRight(180);
dbPositionCamera(dbObjectPositionX(3),dbObjectPositionY(3),dbObjectPositionZ(3));
dbMoveCamera(-dist);
dbPitchCameraDown ( -15 );
		}else{
///this allows the camera to move freely about the plane
			
		dbRotateCamera(dbCameraAngleX()+cry *.0001-cr*.0001,dbCameraAngleY()+crx *.0001-cr*.0001,0);
		dbPositionCamera(dbObjectPositionX(3)-dist*dbCos(dbCameraAngleX())*dbSin(dbCameraAngleY()),dbObjectPositionY(3)+dist*dbSin(dbCameraAngleX()),dbObjectPositionZ(3)-dist*dbCos(dbCameraAngleX())*dbCos(dbCameraAngleY()));
		}
	



}

it is a full program but you should beable to figure out what parts should be transfered to another program.

uuhh... yah...

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Dark GDK / Smooth Follow Camera...