Three.js ShaderMaterial照明无法正常工作

Question

我正在尝试使用Three.js ShaderMaterial并尝试实现照明.我有r70的工作代码,但相同的代码(稍作修改 - MAX_POINT_LIGHTS常量已重命名为NUM_POINT_LIGHTS)对r76不起作用.

查看WebGL Inspector中的跟踪,很明显没有光数据被发送到着色器.那么,灯光坏了还是我需要设置其他东西才能让它工作？

使用r70(工作)

http://codepen.io/anon/pen/KzjXNr?editors=1010

片段着色器

uniform vec3 diffuse;
varying vec3 vPos;
varying vec3 vNormal;
uniform vec3 pointLightColor[MAX_POINT_LIGHTS];
uniform vec3 pointLightPosition[MAX_POINT_LIGHTS];
uniform float pointLightDistance[MAX_POINT_LIGHTS];

void main() {
  vec4 addedLights = vec4(0.1, 0.1, 0.1, 1.0);
  for(int l = 0; l < MAX_POINT_LIGHTS; l++) {
    vec3 lightDirection = normalize(vPos - pointLightPosition[l]);
    addedLights.rgb += clamp(dot(-lightDirection, vNormal), 0.0, 1.0) * pointLightColor[l];
  }
  gl_FragColor = addedLights;
}

JavaScript - 使用UniformsUtils和UniformsLib设置Shadermaterial

var uniforms = THREE.UniformsUtils.merge([
    THREE.UniformsLib['lights'],
    { diffuse: { type: 'c', value: new THREE.Color(0xff00ff) } }
]);
var vertexShader = document.getElementById('vertexShader').text;
var fragmentShader = document.getElementById('fragmentShader').text;
material = new THREE.ShaderMaterial({
      uniforms: uniforms,
      vertexShader: vertexShader,
      fragmentShader: fragmentShader,
      lights: true
    });

var geometry = new THREE.BoxGeometry(200, 200, 200);
mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);

使用r76(futzed)

http://codepen.io/anon/pen/ZWdXLZ?editors=1010

片段着色器

uniform vec3 diffuse;
varying vec3 vPos;
varying vec3 vNormal;
uniform vec3 pointLightColor[NUM_POINT_LIGHTS];
uniform vec3 pointLightPosition[NUM_POINT_LIGHTS];
uniform float pointLightDistance[NUM_POINT_LIGHTS];

void main() {
  vec4 addedLights = vec4(0.1, 0.1, 0.1, 1.0);
  for(int l = 0; l < NUM_POINT_LIGHTS; l++) {
    vec3 lightDirection = normalize(vPos - pointLightPosition[l]);
    addedLights.rgb += clamp(dot(-lightDirection, vNormal), 0.0, 1.0) * pointLightColor[l];
  }
  gl_FragColor = addedLights;
}

JavaScript的

不变

Answer 1

struct在r74中,轻型制服已改为s (特别是在#7324中).请注意,尽管对structr 的更改发生在r74中,但以下内容适用于r75及更高版本.

struct为每种光类型给出单个s 阵列.每个struct有position和color你需要的属性.

片段着色器

uniform vec3 diffuse;
varying vec3 vPos;
varying vec3 vNormal;

struct PointLight {
  vec3 position;
  vec3 color;
};
uniform PointLight pointLights[ NUM_POINT_LIGHTS ];

void main() {
  vec4 addedLights = vec4(0.1, 0.1, 0.1, 1.0);
  for(int l = 0; l < NUM_POINT_LIGHTS; l++) {
    vec3 adjustedLight = pointLights[l].position + cameraPosition;
    vec3 lightDirection = normalize(vPos - adjustedLight);
    addedLights.rgb += clamp(dot(-lightDirection, vNormal), 0.0, 1.0) * pointLights[l].color;
  }
  gl_FragColor = addedLights;//mix(vec4(diffuse.x, diffuse.y, diffuse.z, 1.0), addedLights, addedLights);
}

请注意,灯光位置现在相对于相机,因此您可以使用相机位置偏移灯光位置.

工作小提琴