Can material.mainTexture assignment fail?

Apologies if this is in the wrong place, I'm not certain where best to post it.

I am trying to create a Quad, load a texture into it and display it. The code works fine on PC in editor but displays a white rectangle on Android/GearVR. In the past the code appeared to work but it appears to be fragile.

Code (csharp):

1. imageObject = GameObject.CreatePrimitive(PrimitiveType.Quad);
2. Object.Destroy(imageObject.GetComponent<MeshCollider>());
3. imageObject.transform.parent = parent.transform;
4.  
5. Texture2D imageTexture = new Texture2D(2, 2);
6. byte[] imageBytes = File.ReadAllBytes(imageFile);
7. ImageLoaded = imageTexture.LoadImage(imageBytes);
8.  
9. Material mat = imageObject.GetComponent<Renderer>().material;
10. mat.mainTexture = imageTexture;
11. Shader shd = Shader.Find("Custom/Texture");
12. mat.shader = shd;

I have run / stepped through this code and confirmed that: A quad is rendered of the correct size, position and orientation.

imageTexture is successully created and after LoadImage has the expected width and height (ImageLoaded is true). This info is then used to set the quad size/position, so expected to be correct.

I note that the image file being loaded is a png, containing an alpha channel and is non-power of 2.

The shader is found and successfully assigned (it is used fine elsewhere in the scene).

The only thing that appears not to work is, the assignment of imageTexture to mat.mainTexture. When I put a breakpoint on the line after, it reaches the line but mat.mainTexture is null instead of being the same as imageTexture.

Can anyone tell me how to debug this further? Or suggest an explanation?

Thanks

 

The mainTexture property is the same as using SetTexture with _MainTex, so if the shader has no _MainTex, nothing will happen.

--Eric

 

Thank-you - that explains the problems. It's obvious in retrospect but I don't think I would have spotted it without your help.

I've switched the order so that I set the shader first and then the texture and all is well.