Tiling RenderTexture on Material Created From Script

Code (csharp):

1. RenderTexture rt = new RenderTexture(500, 500, 24);
2. rt.filterMode = FilterMode.Trilinear;
3. rt.anisoLevel = 9;
4. rt.antiAliasing = 8;
5. rt.wrapMode = TextureWrapMode.Repeat;
6.  
7. cam.targetTexture = rt;
8.  
9. Material mat = new Material(Shader.Find("Sprites/Default"));
10. mat.mainTextureScale = new Vector2(0.5f, 0.5f);
11. mat.mainTexture = rt;
12.  
13. go.GetComponent<MeshRenderer>().sharedMaterial = mat;

cam is a Camera that is rendering to the RenderTexture.
go is a blank Quad GameObject created from within the Unity Editor (create > 3d object > quad).

My problem is that setting mainTextureScale does absolutely nothing no matter what values I put into the Vector2. The texture rendered via the Camera appears like it should on the Quad but it always fills the entire Quad.

What am I doing wrong?

 

Figured it out, the "Sprites/Default" shader simply doesn't support tiling (what tricked me is that the tiling/offset options are shown in the Unity Editor, but if you try to modify them they simply reset to 1 or 0).

Edit: Seems like you can't even select a Texture for the "Sprites/Default" or "Sprites/Diffuse" shaders inside the Unity Editor. I guess those are only intended to be used with SpriteRenderer? Might be a good idea for me to use "Unlit/Texture" instead.