Limb ray cast detection using Sparky's

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Hawkblood

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Posted: 30th Nov 2010 23:14

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How can I do like a "pick limb" using Sparky's? I could swear there was something like that in DBP, but I can't find it and if there's a command in Sparky's that's not in the help (or I'm just overlooking), I would rather use it.

Thanks

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_Pauli_

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Posted: 1st Dec 2010 01:34 Edited at: 1st Dec 2010 01:34

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I use Sparky's a lot and I could imagine two ways to achieve this. But these are just ideas, haven't tested them myself...

1) Use SC_GetFaceHit() to get the polygon that was hit by a ray cast. Then check to which limb this polygon/face belongs to. A list that contains this data could be created when the model is loaded to speed things up.

2) Create bounding boxes around each limb and check collision against these boxes. They could be standard primitive boxes that fit to a limb and glued to it.

Now the plot thickens, the fps decreases, and the awesomeness goes through the roof.

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Hawkblood

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Posted: 1st Dec 2010 02:17 Edited at: 1st Dec 2010 02:19

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The first one may be practicle. The second one will not work since I have a limb inside a limb sometimes (actually a lot of times). Is there a DGDK funtion to get the subset info?

EDIT: Actually, if I could get a pointer to the mesh, I could do it with a DX command..... Any help?

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_Pauli_

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Posted: 1st Dec 2010 16:24

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Quote: "Is there a DGDK funtion to get the subset info?"

What do you mean with subset info?

I think you can get a pointer to an object by using dbGetObject( int id ).

Now the plot thickens, the fps decreases, and the awesomeness goes through the roof.

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Hawkblood

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Posted: 1st Dec 2010 18:18

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Quote: "dbGetObject( int id )"

I'll have a look at that. A subset in DX is the same as "limb" in DGDK.

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Hawkblood

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Posted: 2nd Dec 2010 01:53

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I can't find anywhere the actual LPD3DXBASEMESH. I need to be able to get a pointer to that specifically.... Unless someone can direct me to another path to get what I need. I'll keep searching and post if I find the solution....

thanks.

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Hawkblood

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Posted: 2nd Dec 2010 02:35

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OK. I have a method now.... I would love to see a better way since this is kinda hacky:

+ Code Snippet

				for (int i=1;i<LevelData.NumberOfLimbs;i++){
					float lx,ly,lz;
					lx=dbLimbPositionX(LevelMesh,i);
					ly=dbLimbPositionY(LevelMesh,i);
					lz=dbLimbPositionZ(LevelMesh,i);
					dbMakeObjectFromLimb(100+i,LevelMesh,i);
					sObject *O;
					O=dbGetObject(100+i);
					CalculateMeshBounds(O->pFrame->pMesh);
					dbPositionObject(100+i,lx,ly,lz);
					dbHideObject(100+i);
					dbShowObjectBounds(100+i);
					SC_SetupComplexObject(100+i,1,2);
				}

to set it up.

+ Code Snippet

			dbPickScreen(dbMouseX(),dbMouseY(),1.0);
			float dx1,dy1,dz1;
			float dx2,dy2,dz2;
			dx1=dbGetPickVectorX()+dbCameraPositionX();
			dy1=dbGetPickVectorY()+dbCameraPositionY();
			dz1=dbGetPickVectorZ()+dbCameraPositionZ();
			dx2=dbGetPickVectorX()*10000.0+dbCameraPositionX();
			dy2=dbGetPickVectorY()*10000.0+dbCameraPositionY();
			dz2=dbGetPickVectorZ()*10000.0+dbCameraPositionZ();
			tp1=-1;
			if (SC_RayCast(LevelMesh,dx1,dy1,dz1,dx2,dy2,dz2,0)==1){
				dbHideObject(LevelMesh);
				for (int i=1;i<LevelData.NumberOfLimbs;i++){
					dbHideObject(100+i);
				}
				int q;
					tp1=SC_RayCastGroup(1,dx1,dy1,dz1,dx2,dy2,dz2,100);
					dbShowObject(tp1);
				float d1=SC_GetCollisionDistance();
				dbPositionObject(3,(dbGetPickVectorX()*d1)+dbCameraPositionX()
					,(dbGetPickVectorY()*d1)+dbCameraPositionY()
					,(dbGetPickVectorZ()*d1)+dbCameraPositionZ());
			}

for detection.

Any thoughts? I mean it works, but I would have liked to have something a little better.

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