Thanks
I will do some test and see which option is best for my need.
Harald ：
You can quite easily create your own modified copy (or replacement) of the Skeleton PMA Multiply shader. You just have to add the relevant parts from the Skeleton Tint shader
I finally tried the tint black approach recently. I modified the mentioned 3 lines in the shader but the sprites which use multiply blend mode display pure purple color. Is there something else I need to do to make it work?
Here is the modified shader:
// Spine/Skeleton PMA Multiply
// - single color multiply tint
// - unlit
// - Premultiplied alpha Multiply blending
// - No depth, no backface culling, no fog.
// - ShadowCaster pass
Shader "Spine/Blend Modes/Skeleton PMA Multiply" {
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 ("Shadow alpha cutoff", Range(0,1)) = 0.1
[HideInInspector] _StencilRef("Stencil Reference", Float) = 1.0
[HideInInspector][Enum(UnityEngine.Rendering.CompareFunction)] _StencilComp("Stencil Comparison", Float) = 8 // Set to Always as default
// Outline properties are drawn via custom editor.
[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
[HideInInspector][MaterialToggle(_USE8NEIGHBOURHOOD_ON)] _Use8Neighbourhood("Sample 8 Neighbours", Float) = 1
[HideInInspector] _OutlineMipLevel("Outline Mip Level", Range(0,3)) = 0
}
SubShader {
Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
LOD 100
Fog { Mode Off }
Cull Off
ZWrite Off
Blend DstColor OneMinusSrcAlpha
Lighting Off
Stencil {
Ref[_StencilRef]
Comp[_StencilComp]
Pass Keep
}
Pass {
Name "Normal"
CGPROGRAM
#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
uniform sampler2D _MainTex;
uniform float4 _Color;
uniform float4 _Black;
struct VertexInput {
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float4 vertexColor : COLOR;
};
struct VertexOutput {
float4 pos : SV_POSITION;
float2 uv : TEXCOORD0;
float4 vertexColor : COLOR;
};
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); // Combine a PMA version of _Color with vertexColor.
return o;
}
float4 frag (VertexOutput i) : SV_Target {
float4 texColor = tex2D(_MainTex, i.uv);
#if defined(_STRAIGHT_ALPHA_INPUT)
texColor.rgb *= texColor.a;
#endif
return fragTintedColor(texColor, _Black.rgb, i.vertexColor, _Color.a, _Black.a);
//return (texColor * i.vertexColor);
}
ENDCG
}
Pass {
Name "Caster"
Tags { "LightMode"="ShadowCaster" }
Offset 1, 1
ZWrite On
ZTest LEqual
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcaster
#pragma fragmentoption ARB_precision_hint_fastest
#include "UnityCG.cginc"
struct v2f {
V2F_SHADOW_CASTER;
float4 uvAndAlpha : TEXCOORD1;
};
uniform float4 _MainTex_ST;
v2f vert (appdata_base v, float4 vertexColor : COLOR) {
v2f o;
TRANSFER_SHADOW_CASTER(o)
o.uvAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
o.uvAndAlpha.z = 0;
o.uvAndAlpha.a = vertexColor.a;
return o;
}
uniform sampler2D _MainTex;
uniform fixed _Cutoff;
float4 frag (v2f i) : SV_Target {
fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
}
CustomEditor "SpineShaderWithOutlineGUI"
}
