Hi, I need help with "shader mask" for SkeletonAnimation in Unity bescause I don't know anything about shader 🙁
I have 2 types of plants in my project.
Type 1: is a static object, using the sprite renderer + sprite mask component to show the "white shadow" of the character when standing behind the tree.
Type 2: It is an animated tree, it uses SkeletonAnimation with a Skeleton Mask shader that I edited from Skeleton tint black so it has the same effect as type 1.
To edit the skeleton mask shader, I referred to this link:
esotericsoftware.com/forum/d/16082-animated-maskunity-help/7
and added this line of code as advised:
float4 frag (VertexOutput i) : SV_Target {
float4 texColor = tex2D(_MainTex, i.uv);
clip((texColor.a * i.vertexColor.a) - _Cutoff); // add this line
#if defined(_STRAIGHT_ALPHA_INPUT)
texColor.rgb *= texColor.a;
#endif
return (texColor * i.vertexColor);
}
But it seems ineffective. It still has the same problem as in the link I just mentioned, you can see 2 pictures illustrating my 2 types of plants
- Tree (SkeletonAnimation) with shader Spine/Skeleton Mask. It is masked throughout the entire image area, even when the pixels are transparent.
- Tree (Sprite Renderer) with Sprite Mask. It works fine.
Here is the shader code:
`Shader "Spine/Skeleton Mask" {
Properties{
_Color("Tint Color", Color) = (1,1,1,1)
_Black("Dark Color", Color) = (0,0,0,0)
[NoScaleOffset] MainTex("MainTex", 2D) = "black" {}
[Toggle(STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
[Toggle(DARK_COLOR_ALPHA_ADDITIVE)] _DarkColorAlphaAdditive("Additive DarkColor.A", Int) = 0
[HideInInspector] _StencilRef("Stencil Reference", Float) = 1.0
[HideInInspector][Enum(UnityEngine.Rendering.CompareFunction)] _StencilComp("Stencil Comparison", Float) = 8 // Set to Always as default
}
SubShader{
Tags { "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
LOD 100
Fog { Mode Off }
Cull Off
ZWrite Off
Blend One OneMinusSrcAlpha
Lighting Off
Stencil {
Ref[_StencilRef]
Comp[_StencilComp]
Pass Replace
}
Pass {
Name "Normal"
CGPROGRAM
#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
#pragma shader_feature _ _DARK_COLOR_ALPHA_ADDITIVE
#define _ALPHA_CLIP
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
sampler2D _MainTex;
float4 _Color;
float4 _Black;
float2 _Cutoff;
struct VertexInput {
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float4 vertexColor : COLOR;
float2 uv1 : TEXCOORD1;
float2 uv2 : TEXCOORD2;
};
struct VertexOutput {
float4 pos : SV_POSITION;
float2 uv : TEXCOORD0;
float4 vertexColor : COLOR;
float3 darkColor : TEXCOORD1;
};
VertexOutput vert(VertexInput v) {
VertexOutput o;
o.pos = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
o.vertexColor = v.vertexColor * float4(_Color.rgb * _Color.a, _Color.a);
o.darkColor = float3(v.uv1.r, v.uv1.g, v.uv2.r);
return o;
}
#include "CGIncludes/Spine-Skeleton-Tint-Common.cginc"
float4 frag(VertexOutput i) : SV_Target
{
float4 texColor = tex2D(_MainTex, i.uv);
#if defined(_STRAIGHT_ALPHA_INPUT)
texColor.rgb *= texColor.a;
#endif
clip((texColor.a* i.vertexColor.a) - _Cutoff);
return fragTintedColor(texColor, _Black.rgb + i.darkColor, i.vertexColor, _Color.a, _Black.a);
}
ENDCG
}
Pass {
Name "Caster"
Tags { "LightMode" = "ShadowCaster" }
Offset 1, 1
ZWrite On
ZTest LEqual
Fog { Mode Off }
Cull Off
Lighting Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcaster
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
sampler2D _MainTex;
fixed _Cutoff;
struct VertexOutput {
V2F_SHADOW_CASTER;
float4 uvAndAlpha : TEXCOORD1;
};
VertexOutput vert(appdata_base v, float4 vertexColor : COLOR) {
VertexOutput o;
o.uvAndAlpha = v.texcoord;
o.uvAndAlpha.a = vertexColor.a;
TRANSFER_SHADOW_CASTER(o)
return o;
}
float4 frag(VertexOutput i) : SV_Target {
fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
clip(texcol.a* i.uvAndAlpha.a - _Cutoff);
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
}
CustomEditor "SpineShaderWithOutlineGUI"
}`
