hair particle system fix

WickedEngine/wiHairParticle.cpp

@@ -161,7 +161,7 @@ void wiHairParticle::UpdateCPU(const TransformComponent& transform, const MeshCo
 			device->CreateBuffer(&bd, indices.data(), &indexBuffer);
 		}
 
-		if (device->CheckCapability(GRAPHICSDEVICE_CAPABILITY_RAYTRACING))
+		if (device->CheckCapability(GRAPHICSDEVICE_CAPABILITY_RAYTRACING) && primitiveBuffer.IsValid())
 		{
 			RaytracingAccelerationStructureDesc desc;
 			desc.type = RaytracingAccelerationStructureDesc::BOTTOMLEVEL;

WickedEngine/wiScene.cpp

@@ -3602,7 +3602,7 @@ namespace wiScene
 					inst.transformPrev.Create(IDENTITYMATRIX);
 					inst.meshIndex = (uint)meshIndex;
 
-					if (TLAS_instancesMapped != nullptr)
+					if (TLAS_instancesMapped != nullptr && hair.BLAS.IsValid())
 					{
 						// TLAS instance data:
 						RaytracingAccelerationStructureDesc::TopLevel::Instance instance = {};

WickedEngine/wiVersion.cpp

@@ -9,7 +9,7 @@ namespace wiVersion
 	// minor features, major updates, breaking compatibility changes
 	const int minor = 57;
 	// minor bug fixes, alterations, refactors, updates
-	const int revision = 34;
+	const int revision = 35;
 
 	const std::string version_string = std::to_string(major) + "." + std::to_string(minor) + "." + std::to_string(revision);