Camera Orbit - GameCreators Forum

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Zuka

16

Years of Service

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Joined: 21st Apr 2008

Location: They locked me in the insane asylum.

Posted: 3rd Jun 2008 06:59

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I noticed there haven't been any threads about a camera orbit thing in DGDK...

I decided to help the community... enjoy!

+ Code Snippet

float anglea=0.0f;
float angleb=0.0f;
float pointatx=0.0f;
float pointaty=0.0f;
float pointatz=0.0f;
float dist=20.0f;
float movementpernotch=0.5f;
float maxzoom=200.0f;
float minzoom=5.0f;
int pointatobject;

void controlCamera()
{
	pointatx = dbObjectPositionX(object);
	pointaty = dbObjectPositionY(object);
	pointatz = dbObjectPositionZ(object);
	if (dbMouseMoveZ()>0)
	{
		if (dist > (minzoom + movementpernotch))
		{
			dist-=movementpernotch;
		}
	}
	else if (dbMouseMoveZ()<0)
	{
		if (dist > (maxzoom - movementpernotch))
		{
			dist+=movementpernotch;
		}
	} 
	if (dbMouseClick()==4)
	{
		anglea = dbWrapValue(anglea + dbMouseMoveX());
		angleb = dbWrapValue(angleb + dbMouseMoveY());
	}
	dbPositionCamera(pointatx + (dbSin(anglea)* dbSin(angleb) * dist), pointaty + (dbCos(angleb)*dist), pointatz+(dbCos(anglea)*dbSin(angleb)*dist));
	dbPointCamera(pointatx, pointaty, pointatz);

}

If you call "cameraControl()" in your main loop, you can use the middle mouse button to orbit, and mouse wheel to zoom in and out.

It's still preliminal... I'll edit this post once I have a fix.

I AM THE ALL MIGHTY CORNHOLIO! Do you have TP for my bunghole?

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Timmox

16

Years of Service

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Joined: 2nd Jun 2008

Location:

Posted: 4th Jun 2008 14:15

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Hi.. thanks for code snippet I like this routine as I am absolute crap at (trig)... it works well but there is a problem with 360 degree rotation as the image flips 180 when the X or Y angles appoach 270. Can this be compensated for and what is the trig to do this!!!. Can you help modify this or shall we ask the forum members, I will try also but don't hold ur breath?

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Bishop

21

Years of Service

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Joined: 18th Dec 2002

Location: In my favorite chair...

Posted: 6th Jun 2008 10:56 Edited at: 6th Jun 2008 10:58

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Not to crap on your code, but there is a function that already does this =P Here is a much simplified version;

Replace

+ Code Snippet

dbPositionCamera(pointatx + (dbSin(anglea)* dbSin(angleb) * dist), pointaty + (dbCos(angleb)*dist), pointatz+(dbCos(anglea)*dbSin(angleb)*dist));

With

+ Code Snippet

dbSetCameraToFollow( pointatx, pointaty, pointatz, anglea, dist, 5, 10, 0 );

This will follow, and orbit around if the object is spinning, the objects coordinates at a height of 5. It also has a smooth command which will make the movement less jerky.

Cheers!

Tux is my guildmaster.

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