shader 求助

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Shader3D Start
{
type:Shader3D,
name:MyUnlit,
enableInstancing:true,
shaderType:D3,
supportReflectionProbe:true,
uniformMap:{
u_AlphaTestValue: { type: Float, default: 0.5 },
u_TilingOffset: { type: Vector4, default: [1, 1, 0, 0], block: unlit },

    u_AlbedoColor: { type: Color, default: [1, 1, 1, 1], block: unlit },
    u_AlbedoTexture: { type: Texture2D, options: { define: "ALBEDOTEXTURE" } },
},
defines: {
    ENABLEVERTEXCOLOR: { type: bool, default: false }
}
shaderPass:[
    {
        pipeline:Forward,
        VS:unlitVS,
        FS:unlitPS
    }
]

}
Shader3D End

GLSL Start
#defineGLSL unlitVS

#define SHADER_NAME unlitVS

#include "Math.glsl";

#include "Scene.glsl";
#include "SceneFogInput.glsl";

#include "Camera.glsl";
#include "Sprite3DVertex.glsl";

#include "VertexCommon.glsl";

#ifdef UV
varying vec2 v_Texcoord0;
#endif // UV

#ifdef COLOR
varying vec4 v_VertexColor;
#endif // COLOR

void main()
{
    Vertex vertex;
    getVertexParams(vertex);

#ifdef UV
    v_Texcoord0 = transformUV(vertex.texCoord0, u_TilingOffset);
#endif // UV

#ifdef COLOR
    v_VertexColor = vertex.vertexColor;
#endif // COLOR

    mat4 worldMat = getWorldMatrix();
    vec4 pos = (worldMat * vec4(vertex.positionOS, 1.0));
    vec3 positionWS = pos.xyz / pos.w;

    gl_Position = getPositionCS(positionWS);

    gl_Position = remapPositionZ(gl_Position);

#ifdef FOG
    FogHandle(gl_Position.z);
#endif
}

#endGLSL

#defineGLSL unlitPS

#define SHADER_NAME unlitPS

#include "Color.glsl";

#include "Scene.glsl";
#include "SceneFog.glsl";

#include "Camera.glsl";
#include "Sprite3DFrag.glsl";

varying vec4 v_Color;
varying vec2 v_Texcoord0;

void main()
{
    vec2 uv = v_Texcoord0;

    vec3 color = u_AlbedoColor.rgb;
    float alpha = u_AlbedoColor.a;
#ifdef ALBEDOTEXTURE
    vec4 albedoSampler = texture2D(u_AlbedoTexture, uv);
    #ifdef Gamma_u_AlbedoTexture
    albedoSampler = gammaToLinear(albedoSampler);
    #endif // Gamma_u_AlbedoTexture
    color *= albedoSampler.rgb;
    alpha *= albedoSampler.a;
#endif // ALBEDOTEXTURE

#ifdef COLOR
    #ifdef ENABLEVERTEXCOLOR
    vec4 vertexColor = v_Color;
    color *= vertexColor.rgb;
    alpha *= vertexColor.a;
    #endif // ENABLEVERTEXCOLOR
#endif // COLOR

#ifdef ALPHATEST
    if (alpha < u_AlphaTestValue)
        discard;
#endif // ALPHATEST

#ifdef FOG
    color = scenUnlitFog(color);
#endif // FOG

    gl_FragColor = vec4(color, alpha);

    gl_FragColor = outputTransform(gl_FragColor);
}

#endGLSL
GLSL End

这是最基础的 Unlit shader 我想增加一个attribute "a_InstanceUV" 类型是Laya.ShaderDataType.Vector4 应该怎么改 @LayaAir(机器人)

LayaAir(机器人)

在 shader 文件的 JSON 部分加一个 attributeMap，把自定义 attribute 声明进去。注意一旦定义了 attributeMap，默认的就不会自动加了，所以需要把用到的标准 attribute 也一并写上：

attributeMap:{
    a_Position: [Vector4, 0],
    a_Normal: [Vector3, 1],
    a_Tangent0: [Vector4, 2],
    a_Texcoord0: [Vector2, 3],
    a_Texcoord1: [Vector2, 4],
    a_Color: [Vector4, 5],
    a_BoneWeights: [Vector4, 6],
    a_BoneIndices: [Vector4, 7],
    a_WorldMat: [Matrix4x4, 8],
    a_SimpleTextureParams: [Vector4, 9],
    a_LightmapScaleOffset: [Vector4, 10],
    a_WorldInvertFront: [Vector4, 14],
    a_InstanceUV: [Vector4, 12]
},

格式是 "属性名": ["类型", location]，其中 location 12₁₅ 对应引擎的 MESH_CUSTOME0 ~ MESH_CUSTOME3，专门给自定义 attribute 用的。

GLSL 里在 VS 中直接用 a_InstanceUV 就行，建议包在 #ifdef GPU_INSTANCE 里：

#ifdef GPU_INSTANCE
    vec4 instanceUV = a_InstanceUV;
#endif

数据设置方面，需要通过 MaterialInstancePropertyBlock + CommandBuffer.drawMeshInstance() 来传入，参考引擎示例 CommandBuffer_DrawCustomInstance：

const { MaterialInstancePropertyBlock, InstanceLocation } = Laya;
let block = new MaterialInstancePropertyBlock();
block.setVectorArray("a_InstanceUV", uvDataArray, InstanceLocation.CUSTOME0);

InstanceLocation.CUSTOME0 和 attributeMap 里的 location 12 是对应的。

以上由 AI 自动回复，仅供参考。若无异议将不再人工审查；如需人工介入请回帖说明。

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LayaAir(机器人)
我用的IDE是Laya3.4 shader 改完后
有这么个编译错误你看看
Error compiling shader 'UnlitUVI' (pipelineMode=Forward)
Attribute 'a_SimpleTextureParams' aliases attribute 'a_WorldMat' at location 9

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LayaAir(机器人)
这是 laya.core.js
VertexMesh.MESH_POSITION0 = 0;
VertexMesh.MESH_COLOR0 = 1;
VertexMesh.MESH_TEXTURECOORDINATE0 = 2;
VertexMesh.MESH_NORMAL0 = 3;
VertexMesh.MESH_TANGENT0 = 4;
VertexMesh.MESH_BLENDINDICES0 = 5;
VertexMesh.MESH_BLENDWEIGHT0 = 6;
VertexMesh.MESH_TEXTURECOORDINATE1 = 7;
VertexMesh.MESH_WORLDMATRIX_ROW0 = 8;
VertexMesh.MESH_WORLDMATRIX_ROW1 = 9;
VertexMesh.MESH_WORLDMATRIX_ROW2 = 10;
VertexMesh.MESH_WORLDMATRIX_ROW3 = 11;
VertexMesh.MESH_SIMPLEANIMATOR = 12;
VertexMesh.MESH_LIGHTMAPSCALEOFFSET = 13;
VertexMesh.MESH_CUSTOME0 = 12;
VertexMesh.MESH_CUSTOME1 = 13;
VertexMesh.MESH_CUSTOME2 = 14;
VertexMesh.MESH_CUSTOME3 = 15;
location 定义
跟你给的代码是不是不一致
attributeMap:{
a_Position: [Vector4, 0],
a_Normal: [Vector3, 1],
a_Tangent0: [Vector4, 2],
a_Texcoord0: [Vector2, 3],
a_Texcoord1: [Vector2, 4],
a_Color: [Vector4, 5],
a_BoneWeights: [Vector4, 6],
a_BoneIndices: [Vector4, 7],
a_WorldMat: [Matrix4x4, 8],
a_SimpleTextureParams: [Vector4, 9],
a_LightmapScaleOffset: [Vector4, 10],
a_WorldInvertFront: [Vector4, 14],
a_InstanceUV: [Vector4, 12]
},

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LayaAir(机器人) location 修正后可以了能用了