var container;
var camera, scene, renderer;
var mesh;
var uniforms;
var clock = new THREE.Clock();
init();
animate();
function init() {
container = document.getElementById('container');
camera = new THREE.PerspectiveCamera(40, window.innerWidth/window.innerHeight, 0.1, 100);
camera.position.z = 0.6;
camera.position.y = 0.2;
camera.rotation.x = -0.45;
scene = new THREE.Scene();
var boxGeometry = new THREE.PlaneGeometry(0.75, 0.75, 32, 32);
var heightMap = THREE.ImageUtils.loadTexture("data:image/png;base64,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");
heightMap.wrapT = heightMap.wrapS = THREE.RepeatWrapping;
uniforms = {u_time: {type: "f", value: 0.0 }, u_heightMap: {type: "t",value:heightMap} };
var material = new THREE.ShaderMaterial({
uniforms: uniforms,
side: THREE.DoubleSide,
wireframe: false,
vertexShader: document.getElementById('vertexShader').textContent,
fragmentShader: document.getElementById('fragment_shader').textContent
});
mesh = new THREE.Mesh(boxGeometry, material);
mesh.rotation.x = 3.14/2.0;
scene.add(mesh);
renderer = new THREE.WebGLRenderer();
renderer.setClearColor(0x000000, 1);
container.appendChild(renderer.domElement);
onWindowResize();
window.addEventListener('resize', onWindowResize, false);
}
function onWindowResize(event) {
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function animate() {
requestAnimationFrame(animate);
render();
}
function render() {
var delta = clock.getDelta();
uniforms.u_time.value += delta;
//mesh.rotation.z += delta * 0.5;
renderer.render(scene, camera);
}
body { margin: 0px; overflow: hidden; }
<script src="https://threejs.org/build/three.min.js"></script>
<div id="container"></div>
<script id="fragment_shader" type="x-shader/x-fragment">
#extension GL_OES_standard_derivatives : enable
varying vec3 positionWorld; // position of vertex in world coordinates
vec3 ReconstructNormal(vec3 positionWorldSpace)
{
vec3 normalViewSpace = normalize(cross(dFdx(positionWorldSpace), dFdy(positionWorldSpace)));
vec3 normalWorldSpace = (vec4(normalViewSpace, 0.0) * viewMatrix).xyz;
return normalWorldSpace;
}
// Just some example of using a normal. Here we do a really simple shading
void main(void)
{
vec3 lightDir = normalize(vec3(1.0, 1.0, 1.0));
vec3 normal = ReconstructNormal(positionWorld);
float diffuse = max(dot(lightDir, normal), 0.0);
vec3 albedo = vec3(0.2, 0.4, 0.7);
gl_FragColor = vec4(albedo * diffuse, 1.0);
}
</script>
<script id="vertexShader" type="x-shader/x-vertex">
uniform lowp sampler2D u_heightMap;
uniform float u_time;
varying vec3 positionWorld;
// Example of vertex shader that moves vertices
void main()
{
vec3 pos = position;
vec2 offset1 = vec2(1.0, 0.5) * u_time * 0.01;
vec2 offset2 = vec2(0.5, 1.0) * u_time * 0.01;
float hight1 = texture2D(u_heightMap, uv + offset1).r * 0.02;
float hight2 = texture2D(u_heightMap, uv + offset2).r * 0.02;
pos.z += hight1 + hight2;
vec4 mvPosition = modelViewMatrix * vec4(pos, 1.0);
positionWorld = mvPosition.xyz;
gl_Position = projectionMatrix * mvPosition;
}
</script>
あなたはすでに自分自身にそれを説明しました。それらの頂点が同じ場合にのみ、頂点を共有することができます。したがって、2つの頂点の位置が同じで、法線が異なる場合、同じ頂点を表すことはできません。ジオメトリシェーダを使用することもできますが、そのような頂点を共有しないほうが実用的です。 – Vallentin
OpenGL ES 2.0ではジオメトリシェーダが使用できません。 この画像のように、三角形の向きに合わせて三角形の色を付ける必要があります(このため、標準のサーフェスが必要で、頂点も複製できません)。 https://raw.githubusercontent.com/Jam3/jam3-lesson-webgl-shader-threejs/master/images/3.png – Ashish
OpenGL ESであることに気付かなかった。しかし、それは私が元々言ったことを変えない。明確に共有できない頂点を共有しないでください。 – Vallentin