Adjusting alpha cutoff during run time doesn't work

Question

Hello, I am trying to change the render mode of my material on a standard shader to cutout mode with the following code:

 mesh_renderer.materials[0].SetFloat("_Mode", 1);
 mesh_renderer.materials[0].SetFloat("_Cutoff", 1f);

alt text

The code works just fine and the alpha cutoff is set correctly in the inspector, however it doesn't work on the mesh until I drag it to any other value than 1f, and then back to 1f in the inspector, even if I ran the code through update.

Is there a way it would apply the changes to the material from the code, without requiring me to manually do that?

Thanks in advance!

Answer 1

Best Answer

Answer by Thomas-Mountainborn · Aug 17, 2015 at 06:09 PM

A material created at runtime does not have all the necessary standard shader keywords enabled. You need to set a bunch of other ones before you have it set as transparent - by dragging the value in the inspector, the editor does this for you, which is why that works.

 material.SetOverrideTag("RenderType", "TransparentCutout");
 material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);
 material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
 material.SetInt("_ZWrite", 1);
 material.EnableKeyword("_ALPHATEST_ON");
 material.DisableKeyword("_ALPHABLEND_ON");
 material.DisableKeyword("_ALPHAPREMULTIPLY_ON");
 material.renderQueue = 2450;

This post by Farfarer provides a handy method to make your life easier in regards to this issue.

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janidsa · Aug 17, 2015 at 06:58 PM 1

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Thank you! This solved the issue.

Adjusting alpha cutoff during run time doesn't work

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