Function NvFlexExtCreateInstance

extensions/flexExtContainer.cpp:620–685

NvFlexExtInstance* NvFlexExtCreateInstance(NvFlexExtContainer* c, NvFlexExtParticleData* particleData, const NvFlexExtAsset* asset, const float* transform, float vx, float vy, float vz, int phase, float invMassScale)
{	
	const int numParticles = asset->numParticles;

	// check if asset will fit
	if (int(c->mFreeList.size()) < numParticles)
		return NULL;

	NvFlexExtInstance* inst = new NvFlexExtInstance();

	inst->asset = asset;
	inst->triangleIndex = -1;
	inst->shapeIndex = -1;
	inst->inflatableIndex = -1;
	inst->userData = NULL;
	inst->numParticles = numParticles;
	
	assert(inst->numParticles <= asset->maxParticles);

	// allocate particles for instance
	inst->particleIndices = new int[asset->maxParticles];
	int n = NvFlexExtAllocParticles(c, numParticles, &inst->particleIndices[0]);
	assert(n == numParticles);
	(void)n;

	c->mInstances.push_back(inst);

	const Matrix44 xform(transform);

	for (int i=0; i < numParticles; ++i)
	{
		const int index = inst->particleIndices[i];

		// add transformed particles to the locked particle data
		((Vec4*)(particleData->particles))[index] = xform*Vec4(Vec3(&asset->particles[i*4]), 1.0f);
		((Vec4*)(particleData->particles))[index].w = asset->particles[i*4+3]*invMassScale;
		((Vec4*)(particleData->restParticles))[index] = Vec4(&asset->particles[i*4]);

		((Vec3*)(particleData->velocities))[index] = Vec3(vx, vy, vz);
		((int*)(particleData->phases))[index] = phase;
		((Vec4*)(particleData->normals))[index] = Vec4(0.0f);
	}

	const int numShapes = asset->numShapes;

	// allocate memory for shape transforms
	Vec3* shapeTranslations = new Vec3[numShapes];
	Quat* shapeRotations = new Quat[numShapes];

	Quat rotation = Quat(Matrix33(xform.GetAxis(0), xform.GetAxis(1), xform.GetAxis(2)));

	for (int i=0; i < numShapes; ++i)
	{
		shapeTranslations[i] = Vec3(xform*Vec4(asset->shapeCenters[i*3+0], asset->shapeCenters[i*3+1], asset->shapeCenters[i*3+2], 1.0));
		shapeRotations[i] = rotation;
	}

	inst->shapeTranslations = (float*)shapeTranslations;