javascript - 如何在 THREE.js 中正确制作法线贴图？

Question

我刚刚尝试应用 Normal map Ninja demo使用以下代码添加到我场景中的立方体 - 使用来自 dev 分支的最新 Three.js 版本:

// common material parameters

var ambient = 0x050505, diffuse = 0x331100, specular = 0xffffff, shininess = 10, scale = 23;

// normal map shader

var shader = THREE.ShaderUtils.lib[ "normal" ];
var uniforms = THREE.UniformsUtils.clone( shader.uniforms );

uniforms[ "enableAO" ].value = true;
uniforms[ "enableDiffuse" ].value = false;
uniforms[ "enableSpecular" ].value = false;
uniforms[ "enableReflection" ].value = true;

uniforms[ "tNormal" ].texture = THREE.ImageUtils.loadTexture( "normal.jpg" );
uniforms[ "tAO" ].texture = THREE.ImageUtils.loadTexture( "ao.jpg" );

uniforms[ "tDisplacement" ].texture = THREE.ImageUtils.loadTexture( "displacement.jpg" );
uniforms[ "uDisplacementBias" ].value = - 0.428408 * scale;
uniforms[ "uDisplacementScale" ].value = 2.436143 * scale;

uniforms[ "uDiffuseColor" ].value.setHex( diffuse );
uniforms[ "uSpecularColor" ].value.setHex( specular );
uniforms[ "uAmbientColor" ].value.setHex( ambient );

uniforms[ "uShininess" ].value = shininess;

uniforms[ "tCube" ].texture = reflectionCube;
uniforms[ "uReflectivity" ].value = 0.1;

uniforms[ "uDiffuseColor" ].value.convertGammaToLinear();
uniforms[ "uSpecularColor" ].value.convertGammaToLinear();
uniforms[ "uAmbientColor" ].value.convertGammaToLinear();


var parameters = { fragmentShader: shader.fragmentShader, vertexShader: shader.vertexShader, uniforms: uniforms, lights: true, fog: false };
var displacementMaterial = new THREE.ShaderMaterial( parameters );

/*
var diamond = new THREE.Diamond({
    material: bumpmapMaterial
});
*/

var diamond = new THREE.Mesh(
    new THREE.CubeGeometry(50, 50, 50),
    displacementMaterial
);

但是，我在 Chrome 中收到以下 WebGL 错误:

GL_INVALID_OPERATION : glDrawXXX: attempt to access out of range vertices

在 Firefox 中，我没有收到这样的错误，但立方体也不会出现。使用标准彩色 MeshLambertMaterial，一切正常。因此，需要与 ShaderMaterial 发生冲突。如果我使用来自 MASTER 分支的最新 Three.js 版本，它不会改善情况 - 会发生同样的错误。

知道为什么会出现这种情况以及我需要更改什么才能使其正常工作吗？

Answer 1

试过添加这个吗？

geometry.computeTangents();