RaycastHit.triangleIndex Frame Drop!

I'm working on wheel surface detection for some cars. I've got everything working perfectly but when I run the scene, there's a very noticeable frame drop.

Here's the snippet of code that handles surface detection :

Code (CSharp):

1. private Texture2D GetSurfaceTexture(){
2.  
3. Texture2D texture = null;
4.  
5. if (Physics.Raycast(transform.position + (Vector3.up * 0.1f), Vector3.down, out hit, 0.2f + (GetComponent<WheelCollider>().radius))){
6.  
7. if(hit.collider.gameObject.GetComponent<Renderer>()){
8.  
9. MeshFilter meshFilter = (MeshFilter)hit.collider.GetComponent(typeof(MeshFilter));
10. Mesh mesh = meshFilter.mesh;
11. int totalSubMeshes = mesh.subMeshCount;
12. int[] subMeshes = new int[totalSubMeshes];
13.            
14. for(int i = 0; i < totalSubMeshes; i++){
15. subMeshes[i] = mesh.GetTriangles(i).Length / 3;
16. }
17.            
18. int hitSubMesh = 0;
19. int maxVal = 0;
20.            
21. for(int i = 0; i < totalSubMeshes; i ++){
22. maxVal += subMeshes[i];
23.  
24. if(hit.triangleIndex <= maxVal - 1){
25. hitSubMesh = i + 1;
26. break;
27. }
28. }
29.  
30. texture = (Texture2D)hit.collider.gameObject.GetComponent<Renderer>().materials[hitSubMesh-1].mainTexture;
31. }
32. }
33.  
34. return texture;
35. }

Basically, what I do is get the triangle the ray hit and then return it's material's main texture.

I get an average of 40 fps if I call this function and an average of 60 fps if I don't.

Does anyone know what I could be doing wrong or how to fix this?

Thanks.

 

I'm assuming you're doing this for friction or sound purposes: You're waaaaaaaaay better off just adding some sort of description to the GameObject itself and pulling that information instead, whether you tag it as Asphalt / Dirt / Grass or create some sort of enum and throw it in a component.

 

Hey @GroZZleR , thanks for your reply.

Yeah, I'm doing it for friction, sound & particle purposes.

I wish it was that easy but it isn't. Most meshes use multiple materials on the same mesh so to get the current texture the wheel is on, I need to find the material that the triangle uses and get it's material's main texture.

I never knew this would drop the framerate by about 10 - 20.

Anyone know if there an efficient way of getting this done?

Thanks.