I’m not sure if anyone is familiar with the UMA project. Whether you are or not won’t matter but it would make it a littler easier to understand my situation. When UMA generates a human, it has 3 materials generated at runtime that all use the Unity Standard Shader.
The body has a render mode of opaque.
The hair has a render mode of cutout.
The eyelashes have a render mode of fade.
When I generate an image from my UMA character for his/her paperdoll and when I generate a headshot, I do it on-the-fly from the actual character in the scene but with an unlit shader using RenderWithShader:
camera.RenderWithShader(Shader.Find("Unlit/Dim"), "RenderType");
At first, I did not specify a replacement shader but then I noticed the eyelashes were messed up. The render mode of “fade” was not working right with my unlit shader so I just wanted to go without the eyelashes for paperdolls and head portraits, to make it simple.
Looking at the docs, it sounded like I needed to use RenderType for it, as I did above, and then add a tag to my shader:
Shader "Unlit/Dim" {
Properties {
_MainTex ("Base", 2D) = "white" {}
}
SubShader {
Tags { "RenderType"="Opaque" }
LOD 100
...
When I specify Opaque, I only get the body, which doesn’t make sense. I expected to see all 3 materials since they are all using the opaque standard shader. Here is a snipped from the standard Unity shader:
SubShader
{
Tags { "RenderType"="Opaque" "PerformanceChecks"="False" }
LOD 300
Even if this worked right, it wouldn’t have solved my problem, obviously, because I wouldn’t have eliminated the eyelashes. But, because of this, I REALLY don’t understand this now and I couldn’t attempt to solve my problem (by possibly making copies of the standard shader and change the tags on each one: have a transparent and cutout version, go into the UMA code and have it use the respective shaders and then I’d be able to filter on it and use only the shaders with the tags I want).
If anyone may know why I’m only getting the body, or if you have a better solution to not render the eyelashes (or have them work right with my unlit shader), please let me know. As you can see above, the body only differs from the hair and eyelashes by the render MODE. I’m not sure what that would have to do with the Render TYPE tag. I’m still lost about why the hair disappeared too. PLEASE HELP 
EDIT: Here is my entire shader for generating headshots and paperdolls:
Shader "Unlit/Dim" {
Properties {
_MainTex ("Base", 2D) = "white" {}
}
SubShader {
Tags { "RenderType"="Opaque" }
LOD 100
Pass {
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#pragma multi_compile_fog
#include "UnityCG.cginc"
struct appdata_t {
float4 vertex : POSITION;
float2 texcoord : TEXCOORD0;
UNITY_VERTEX_INPUT_INSTANCE_ID
};
struct v2f {
float4 vertex : SV_POSITION;
float2 texcoord : TEXCOORD0;
UNITY_FOG_COORDS(1)
UNITY_VERTEX_OUTPUT_STEREO
};
sampler2D _MainTex;
float4 _MainTex_ST;
v2f vert (appdata_t v)
{
v2f o;
UNITY_SETUP_INSTANCE_ID(v);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
o.vertex = UnityObjectToClipPos(v.vertex);
o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
UNITY_TRANSFER_FOG(o,o.vertex);
return o;
}
fixed4 frag (v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.texcoord);
UNITY_APPLY_FOG(i.fogCoord, col);
UNITY_OPAQUE_ALPHA(col.a);
col.r *= 0.7;
col.g *= 0.6;
col.b *= 0.6;
return col;
}
ENDCG
}
}
}