WEBGL：INVALID_VALUE：vertexAttribPointer：索引超出范围，INVALID_VALUE：enableVertexAttribArray：索引超出范围

Question

我从 .obj 文件读取数据来绘制 model.I 通过使用纹理和顶点正确绘制模型。但是，当我想使用照明进行绘制时，出现错误。此错误是 WebGL：

INVALID_VALUE: vertexAttribPointer: index out of range, INVALID_VALUE: enableVertexAttribArray: index out of range.

这段代码是我的顶点着色器

var VertexShaderCode =  "precision mediump float;\n"+
                         "attribute vec3 vertexPos;\n" +
                         "attribute vec3 vertexNormal;\n"+
                         "uniform mat4 modelViewMatrix;\n" +
                         "uniform mat4 projectionMatrix;\n" +
                         "attribute vec2 aTextureCoord;\n" +
                         "varying vec2 vTextureCoord;\n" +
                         "    void main(void) {\n" +
                         "    gl_Position =  projectionMatrix * modelViewMatrix * vec4(vertexPos, 1.0); \n" +
                         "    vTextureCoord = aTextureCoord;\n"+
                         "}\n";

这是我的片段着色器代码

var FragmentShaderCode =  "precision lowp float;"+
                           "uniform vec4 color;"+
                           "varying vec2 vTextureCoord;"+
                            "uniform vec3 u_Ambient_color;\n" +
                           "uniform sampler2D uSampler;"+
                           "uniform int texturecontrol;"+
                           "void main() { "+
                           "vec3 uColor;"+
                           "uColor = u_Ambient_color * vec3(color);"+
                           " if(texturecontrol !=0 )"+
                           " {"+
                           "  gl_FragColor =texture2D(uSampler, vTextureCoord)*vec4(uColor,color.a);"+
                           " }"+
                           " else{"+
                           "  gl_FragColor = vec4(uColor,color.a);"+
                           " }"+
                           "}"

我试着画成这样。

if(this.Materyals[i].HasTexture){
    this.gl.uniform1i(this.FGlobe.PModeltexturecontrol,1)
    this.gl.uniform3fv(this.FGlobe.PModelAmbientColorLoc,this.Materyals[i].ambient)
    this.gl.uniform4fv(this.FGlobe.PModelColorLoc,this.Materyals[i].color)
    this.gl.bindTexture(this.gl.TEXTURE_2D,this.Materyals[i].Texture)
    this.gl.bindBuffer(this.gl.ARRAY_BUFFER,this.Materyals[i].textureCoord)
    this.gl.vertexAttribPointer(this.FGlobe.PModeltextCoordLoc,2,this.gl.FLOAT,false,0,0)  //şu anda this.gl.ARRAY_BUFFER'a geçerli olan tamponun mevcut köşe tamponu nesnesinin genel bir vertex özniteliğine bağlanması ve düzenini belirtir.
    this.gl.enableVertexAttribArray(this.FGlobe.PModeltextCoordLoc)
}else{            
    this.gl.uniform1i(this.FGlobe.PModeltexturecontrol,0)
    this.gl.uniform3fv(this.FGlobe.PModelAmbientColorLoc,this.Materyals[i].ambient)
    this.gl.uniform4fv(this.FGlobe.PModelColorLoc,this.Materyals[i].color)
    this.gl.disableVertexAttribArray(this.FGlobe.PModeltextCoordLoc)
}
this.gl.bindBuffer(this.gl.ARRAY_BUFFER,this.Materyals[i].normalBuffer)
this.gl.vertexAttribPointer(this.FGlobe.PModelnormalPos,3, this.gl.FLOAT, false, 0, 0)
this.gl.enableVertexAttribArray(this.FGlobe.PModelnormalPos)


this.gl.bindBuffer(this.gl.ARRAY_BUFFER,this.Materyals[i].vertexBuffer)
this.gl.vertexAttribPointer(this.FGlobe.PModelvertexPos,3, this.gl.FLOAT, false, 0, 0)
this.gl.enableVertexAttribArray(this.FGlobe.PModelvertexPos)
this.gl.drawArrays(this.gl.TRIANGLES,0, this.Materyals[i].TriCnt*3);
}

有什么想法吗？我该怎么办？

Answer 1

您为 vertexAttribPointer 和 enableVertexAttribArray 指定的属性索引不正确。您没有提供设置这些值的代码，但您应该仔细检查您的代码中没有获取属性和制服位置的拼写错误。

Answer 2

我怀疑这是因为您有一个未使用的属性 vertexNormal。如果在代码中添加一行：

var VertexShaderCode =  "precision mediump float;\n"+
                     "attribute vec3 vertexPos;\n" +
                     "attribute vec3 vertexNormal;\n"+
                     "uniform mat4 modelViewMatrix;\n" +
                     "uniform mat4 projectionMatrix;\n" +
                     "attribute vec2 aTextureCoord;\n" +
                     "varying vec2 vTextureCoord;\n" +
                     "    void main(void) {\n" +
                     "    vertexNormal; \n" +               /* This line here */
                     "    gl_Position =  projectionMatrix * modelViewMatrix * vec4(vertexPos, 1.0); \n" +
                     "    vTextureCoord = aTextureCoord;\n"+
                     "}\n";

事情可能会很好。如果是这种情况，可能是因为 WebGL 优化掉了该属性，因为它没有被使用。

WEBGL：INVALID_VALUE：vertexAttribPointer：索引超出范围，INVALID_VALUE：enableVertexAttribArray：索引超出范围

WEBGL: INVALID_VALUE: vertexAttribPointer: index out of range, INVALID_VALUE: enableVertexAttribArray: index out of range

lighting

normals

webgl

vertex-shader

fragment-shader