Method addWindMills

physx/samples/samplelargeworld/ChunkLoader.cpp:109–228

}

void SampleLargeWorld::addWindMills(const PxTriangleMeshGeometry& meshGeom, BasicRandom& random, const PxBounds3& bound, PxCollection& outCollection)
{
	PxPhysics& physics = getPhysics();
	PxMaterial& material = getDefaultMaterial();

	const PxReal millHalfHeight = 20.0f;
	const PxReal millRadius =9.0f;
	const PxReal fanRadius = 22.0f;
	const PxReal fanWidth = 3.0f;
	const PxReal fanThin = 0.5f;
	const PxReal axisHalfHeight = 5.0f;
	const PxReal axisRadius = 1.0f;
	const PxVec3 millExtent(
		millRadius*0.5f + axisHalfHeight + axisRadius + fanThin,
		fanRadius*0.5f + millRadius + millHalfHeight,
		millRadius*0.5f + axisHalfHeight + axisRadius + fanThin
		) ;

	PxBounds3 millBornBound = bound;
	millBornBound.fattenFast(-millRadius*2.0f);

	//Store mill position to check if new mill is overlaped with old mills
	PxVec3 millPts[5];

	PxU32 mills = 0, retryNum = 1;
	do
	{
		//Raycast against terrain from random pos to get mill foot point
		PxVec3 rayStart(
			random.rand( millBornBound.minimum.x, millBornBound.maximum.x),
			bound.maximum.y,
			random.rand( millBornBound.minimum.z, millBornBound.maximum.z));

		PxReal maxDist = 2*(bound.maximum.y - bound.minimum.y);				

		PxRaycastHit hit;

		PxU32 hitsNum = PxGeometryQuery::raycast(
												rayStart, PxVec3(0.0f,-1.0f,0.0f), 
												meshGeom, PxTransform(PxIdentity), maxDist, 
												PxHitFlag::ePOSITION, 1, &hit);

		if( hitsNum )
		{
			PxVec3 millPt = hit.position;
			millPt.y += millHalfHeight - millRadius;

			PxVec3 axisPt = millPt;
			axisPt.y += millHalfHeight + millRadius;
			axisPt.x += millRadius;

			PxVec3 fanPt = axisPt;
			fanPt.x += axisHalfHeight;

		    //Roughly check if fans of mill collided with terrain	
			PxQueryFilterData filter( PxQueryFlag::eANY_HIT);
			PxOverlapBuffer buf;
			PxBoxGeometry fanBox(fanThin, fanRadius, fanRadius);