Why Diffuse != Transparent/Diffuse (alpha = 1).

Unity Engine
1

I’m trying to make fade in/out object. All of what I found on web is change color.a in a transparent shader. I add the transparent/Diffuse shader (alpha = 1) and don’t get result similar as Diffuse shader.

How can I fix that or may be you know better solution for making a fade in/out object?

1027969--38145--$TransparentShader.jpg
1027969--38145--$TransparentShader.jpg800×293 55.2 KB

2

This is because transparent shaders do not write to the depth buffer. So for complex geometry like yours, you will get “wrong rendering order” effects.

A workaround could be making a shader that is transparent, but also writes to the depth buffer, perhaps in a separate pass. Here’s an example:

Shader "Transparent/Diffuse ZWrite" {
Properties {
	_Color ("Main Color", Color) = (1,1,1,1)
	_MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
}
SubShader {
	Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
	LOD 200

	// extra pass that renders to depth buffer only
	Pass {
		ZWrite On
		ColorMask 0
	}

	// paste in forward rendering passes from Transparent/Diffuse
	UsePass "Transparent/Diffuse/FORWARD"
}

Fallback "Transparent/VertexLit"
}

Attached image, right side is using this shader.

1027982--38146--$WrongRenderOrder.png

1 Like
3

Aras, thx a lot. It’s very helpful for me.