Need help NewtonCreateSphere

[anandh]

Hi,
I have .3ds ball mesh,did u know how to calculate
dFloat radiusX,radiusY, radiusZ - sphere radius along x axis from my ball scenode
regards
anandh

[roxaz]

for any objects to create collision i use NewtonCreateConvexHull(). Its very hard to calculate exact values of models. I gues only possible way is to set random values, turn on debug geometry and then adjust values till you got it perfect. Anyway for NewtonCreateConvexHull() use this:

Code: Select all

NewtonCollision *PIN::getConvexCollision(IMesh *MyMesh)
{
	// Init stuff 

	int BufferCount = MyMesh->getMeshBufferCount(); 
	IMeshBuffer *mb = 0;
	float *varray = 0; 

	// Loop through all vertices and add them to an array of float that newton wants. 

	for (int bi = 0 ; bi < BufferCount ; bi++) 
	{ 
		mb = MyMesh->getMeshBuffer(bi); 
		int VerticeCount = mb->getVertexCount(); 
		varray = new float[VerticeCount*3]; 
		switch(mb->getVertexType()) 
		{ 
			case EVT_STANDARD: 
			{ 
				S3DVertex* Vertices = (S3DVertex*)mb->getVertices(); 
				for (int ii = 0 ; ii < VerticeCount ; ii++) 
				{ 
					varray[(ii*3)] = Vertices[ii].Pos.X * IrrToNewton; 
					varray[(ii*3)+1] = Vertices[ii].Pos.Y * IrrToNewton; 
					varray[(ii*3)+2] = Vertices[ii].Pos.Z * IrrToNewton; 
				} 
			break; 
			} 
			case EVT_2TCOORDS: 
			{ 
				S3DVertex2TCoords* Vertices = (S3DVertex2TCoords*)mb->getVertices(); 
				for (int ii = 0 ; ii < VerticeCount ; ii++) 
				{ 
					varray[(ii*3)] = Vertices[ii].Pos.X * IrrToNewton; 
					varray[(ii*3)+1] = Vertices[ii].Pos.Y * IrrToNewton; 
					varray[(ii*3)+2] = Vertices[ii].Pos.Z * IrrToNewton; 
				} 
			break; 
			} 
		} 
	}

	NewtonCollision *collision = NewtonCreateConvexHull(pWorld, mb->getVertexCount(), varray, sizeof(float)*3, 0);

	return collision;
}

if you are not using IrrToNewton - delete it or declare const float IrrToNewton = 1;

[white tiger]

they are half the size of the bounding box respectively on x,y,z