之后我原来的职位被标记为“太宽”的其他堆栈溢出的用户。我会重组在更短的线路我的问题。我已经实现在shadertoy射线行军，以及i理解所有关于射线对象交叉点的数学。我想做出下一步的光线追迹与网格。我发现，这样做需要与延迟再现和帧缓冲区（2通道渲染，一个用于几何形状和另一个用于照明计算，射线追踪）和交点将与射线 - 三角形相交发生完成。
当然，我将发布一些代码在接下来的几周，我将开始实现这一点。我需要一些具体的帮助，但到那时，我将不胜感激的帮助，以现在浪费时间在网上搜索。这就是为什么我张贴在这里..
这是我第一次张贴到堆栈溢出。我的目标是编写与网格对象光线追踪。
到目前为止，我已经完成了唯一的事情就是让与球体和平面的射线追踪。这与前渲染完成，并同时创造在片段着色器的所有几何结构（这是很容易产生的球体和平面）。
所有我已经做了研究后，我终于找到了解决办法。这是通过在其中创建的几何形状和其传递给G-缓冲器作为纹理，然后与第二遍在启动用于照明和光线追踪的计算延迟着色技术来完成。
我寻求指导，因为我已经为了得出这个结论，因为我不熟悉，既没有着色器，也没有图形库花了很多天/月（3-4）。我的问题如下：
1）这是方法正确吗？ 2）其次有人可以指导我在三角形交叉？由术语三角形交叉我并不意味着数学和光线 - 三角形相交的程序;我知道。我不知道是第一个十字路口，如何检查接下来的碰撞，如何测试下一个三角形之后。以什么方式，我需要通过在G缓冲区的顶点，以便通过它们来遍历和检查交叉口（一些示例代码GLSL将是很好理解）？
这里是我为了有读得出这个结论的链接
如果我错过了在堆栈溢出社区有任何联系，请在这里发表他们。
我将不胜感激任何相对于答案的答案。先感谢您。
我还以为自己，有困难时期开始。但它是非常容易的。 您需要将网格数据打包成RGB（A）的纹理，然后uppack它的片段着色器内 这种技术的一些很好的工艺流程图，下面是一个例子：http://www.cs.harvard.edu/~sjg/papers/gim.pdf 质地布局exampel： 使用RGB（Alpha通道可用于材质指数）
colums colums colums
| 0 | 1 | 2
| R G B | R G B | R G B
|-------------|-----------|-----------
rows| 1 0 0 | |
CPU方面： gl.texImage2D（gl.TEXTURE_2D，0，gl.RGB32F，dataLenght /信道，1，0，gl.RGB，gl.FLOAT，meshVerts）; texImage2D reference GPU方面： texelFetch（uMeshData，ivec2（vertIndex，0），0）; texelFetch reference
一些资源/链接： 用C ++编写，但实际上谈话是不是远到的#Version 300个ES GLSL着色器： scratchapixel OpenGL的发展Cookbook有一些expampels阅读obj转换为图像片段 the source on github 我本人来说认为这是网络上最好的pathtracer： 我的小知识，我可以看到，这家伙阅读Physically Based Rendering书进行到底 这里真的是很好的教程，了解concept of computer graphics UPDATE /编辑：Peter Shirleys Raytracing in a Weekend是免费下载
我自己的小尝试
(() => {
'use strict';
// vertex
const vs = `#version 300 es\nin vec2 p;out vec2 vuv;void main(){gl_Position = vec4(vuv = p, 0, 1);}`;
// fragment
const fs = `#version 300 es\n
precision highp float;
precision highp int;
precision highp sampler2D;
in vec2 vuv;
uniform float time;
uniform vec2 Res, mouse;
uniform sampler2D uMeshData;
uniform int vertsCount;
layout(location = 0) out lowp vec4 fragColor;
struct Ray {
vec3 orig, dir;
}R_;
mat4 rotate() {
float x = mouse.x, y=mouse.y+sin(time*2.),z=0.;
float a = sin(x), b = cos(x), c = sin(y), d = cos(y), e = sin(z), f = cos(z), ac = a * c, bc = b * c;
return mat4(d * f, d * e, -c, 0.0, ac * f - b * e, ac * e + b * f, a * d, 0.0, bc * f + a * e, bc * e - a * f, b * d, 0.0, 0.0, 0.0, 0.0, 1.0);
}
// https://github.com/Jojendersie/gpugi/blob/5d18526c864bbf09baca02bfab6bcec97b7e1210/gpugi/shader/intersectiontests.glsl#L63
bool isTriangle(Ray ray, in vec3 p0, in vec3 p1, in vec3 p2, out vec3 N) {
vec3 e0 = p1 - p0, e1 = p0 - p2;
N = cross(e1, e0);
vec3 e2 = (1.0 / dot(N, ray.dir)) * (p0 - ray.orig);
vec3 i = cross(ray.dir, e2);
vec3 b = vec3(0.0, dot(i, e1), dot(i, e0));
b.x = 1.0 - (b.z + b.y);
return (dot(N, e2) > 1e-8) && all(greaterThanEqual(b, vec3(0.0)));
}
void Camera(out Ray ray, vec3 lookAt, vec3 up, float angle, float aspect) {
vec3 g = normalize(lookAt - ray.orig);
vec3 u = normalize(cross(g, up));
vec3 v = normalize(cross(u, g));
u = u * tan(radians(angle * .5));
v = v * tan(radians(angle * .5)) / aspect;
ray.dir = normalize(g + ray.dir.x * u + ray.dir.y * v);
}
void main() {
vec3 SceneCol = vec3(0.5);
vec3 hit = vec3(0.);
vec4 a = vec4(0.0), b = vec4(0.0), c = vec4(0.0);
R_ = Ray(vec3(0.0, 0.0, 3.0), vec3(vuv, -1.));
Camera(R_, vec3(0., 0., 1.), vec3(0., 1., 0.), 90.0, (Res.x / Res.y));
float mindist = -1000.0;
// here comes this importend part unpack the texture
for (int i = 0; i < vertsCount; i += 3)
{
a = rotate() * texelFetch(uMeshData, ivec2(i, 0), 0);
b = rotate() * texelFetchOffset(uMeshData, ivec2(i, 0), 0, ivec2(1, 0));
c = rotate() * texelFetchOffset(uMeshData, ivec2(i, 0), 0, ivec2(2, 0));
if (isTriangle(R_, a.xyz, b.xyz, c.xyz, hit))
{
float z = hit.z;
if (z > mindist) {
mindist = z;
SceneCol.rgb = vec3(hit.x, hit.y, 1. - (hit.x - hit.y));
};
}
}
vec3 sky = vec3(0.5, 0.25, 0.1) * (-R_.dir.y - 0.1);
fragColor.rgb = SceneCol + sky;
fragColor.a = 1.0;
}`;
const canvas = document.getElementById('c');
const gl = canvas.getContext('webgl2', {
alpha: !1,
depth: !1,
stencil: !1,
antialias: !1,
premultipliedAlpha: !1,
presereDrawingBuffer: !1,
failIfMajorPerformanceCaveat: !1
});
const { width, height } = canvas.getBoundingClientRect();
gl.canvas.width = width;
gl.canvas.height = height;
// init
const P = gl.createProgram();
const Fp = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(Fp, fs);
gl.compileShader(Fp);
if (!gl.getShaderParameter(Fp, gl.COMPILE_STATUS)) throw '! F r a g: ' + gl.getShaderInfoLog(Fp);
gl.attachShader(P, Fp);
const Vp = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(Vp, vs);
gl.compileShader(Vp);
if (!gl.getShaderParameter(Vp, gl.COMPILE_STATUS)) throw '! V e r t: ' + gl.getShaderInfoLog(Vp);
gl.attachShader(P, Vp);
// link use program
gl.linkProgram(P);
gl.useProgram(P);
// uniform location
const time_loc = gl.getUniformLocation(P, 'time');
const res_loc = gl.getUniformLocation(P, 'Res');
const uLvertices = gl.getUniformLocation(P, 'vertsCount');
const uLSr = gl.getUniformLocation(P, 'uMeshData');
const mouse_loc = gl.getUniformLocation(P, 'mouse');
// free resources
gl.detachShader(P, Fp);
gl.detachShader(P, Vp);
gl.deleteProgram(P);
// fullscreen quad
gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer());
gl.bufferData(gl.ARRAY_BUFFER, new Int8Array([-3, 1, 1, -3, 1, 1]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 2, gl.BYTE, !1, 0, 0);
gl.bindVertexArray(null);
// bind texture
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
// blender 2.79 Icosphere
// export -> *.raw (needs to be enable first under settings)
const verts = [
0.000000, 0.000000, -1.000000, 0.425323, -0.309011, -0.850654, -0.162456, -0.499995, -0.850654,
0.723607, -0.525725, -0.447220, 0.425323, -0.309011, -0.850654, 0.850648, 0.000000, -0.525736,
0.000000, 0.000000, -1.000000, -0.162456, -0.499995, -0.850654, -0.525730, 0.000000, -0.850652,
0.000000, 0.000000, -1.000000, -0.525730, 0.000000, -0.850652, -0.162456, 0.499995, -0.850654,
0.000000, 0.000000, -1.000000, -0.162456, 0.499995, -0.850654, 0.425323, 0.309011, -0.850654,
0.723607, -0.525725, -0.447220, 0.850648, 0.000000, -0.525736, 0.951058, -0.309013, 0.000000,
-0.276388, -0.850649, -0.447220, 0.262869, -0.809012, -0.525738, 0.000000, -1.000000, 0.000000,
-0.894426, 0.000000, -0.447216, -0.688189, -0.499997, -0.525736, -0.951058, -0.309013, 0.000000,
-0.276388, 0.850649, -0.447220, -0.688189, 0.499997, -0.525736, -0.587786, 0.809017, 0.000000,
0.723607, 0.525725, -0.447220, 0.262869, 0.809012, -0.525738, 0.587786, 0.809017, 0.000000,
0.723607, -0.525725, -0.447220, 0.951058, -0.309013, 0.000000, 0.587786, -0.809017, 0.000000,
-0.276388, -0.850649, -0.447220, 0.000000, -1.000000, 0.000000, -0.587786, -0.809017, 0.000000,
-0.894426, 0.000000, -0.447216, -0.951058, -0.309013, 0.000000, -0.951058, 0.309013, 0.000000,
-0.276388, 0.850649, -0.447220, -0.587786, 0.809017, 0.000000, 0.000000, 1.000000, 0.000000,
0.723607, 0.525725, -0.447220, 0.587786, 0.809017, 0.000000, 0.951058, 0.309013, 0.000000,
0.276388, -0.850649, 0.447220, 0.688189, -0.499997, 0.525736, 0.162456, -0.499995, 0.850654,
-0.723607, -0.525725, 0.447220, -0.262869, -0.809012, 0.525738, -0.425323, -0.309011, 0.850654,
-0.723607, 0.525725, 0.447220, -0.850648, 0.000000, 0.525736, -0.425323, 0.309011, 0.850654,
0.276388, 0.850649, 0.447220, -0.262869, 0.809012, 0.525738, 0.162456, 0.499995, 0.850654,
0.894426, 0.000000, 0.447216, 0.688189, 0.499997, 0.525736, 0.525730, 0.000000, 0.850652,
0.525730, 0.000000, 0.850652, 0.162456, 0.499995, 0.850654, 0.000000, 0.000000, 1.000000,
0.525730, 0.000000, 0.850652, 0.688189, 0.499997, 0.525736, 0.162456, 0.499995, 0.850654,
0.688189, 0.499997, 0.525736, 0.276388, 0.850649, 0.447220, 0.162456, 0.499995, 0.850654,
0.162456, 0.499995, 0.850654, -0.425323, 0.309011, 0.850654, 0.000000, 0.000000, 1.000000,
0.162456, 0.499995, 0.850654, -0.262869, 0.809012, 0.525738, -0.425323, 0.309011, 0.850654,
-0.262869, 0.809012, 0.525738, -0.723607, 0.525725, 0.447220, -0.425323, 0.309011, 0.850654,
-0.425323, 0.309011, 0.850654, -0.425323, -0.309011, 0.850654, 0.000000, 0.000000, 1.000000,
-0.425323, 0.309011, 0.850654, -0.850648, 0.000000, 0.525736, -0.425323, -0.309011, 0.850654,
-0.850648, 0.000000, 0.525736, -0.723607, -0.525725, 0.447220, -0.425323, -0.309011, 0.850654,
-0.425323, -0.309011, 0.850654, 0.162456, -0.499995, 0.850654, 0.000000, 0.000000, 1.000000,
-0.425323, -0.309011, 0.850654, -0.262869, -0.809012, 0.525738, 0.162456, -0.499995, 0.850654,
-0.262869, -0.809012, 0.525738, 0.276388, -0.850649, 0.447220, 0.162456, -0.499995, 0.850654,
0.162456, -0.499995, 0.850654, 0.525730, 0.000000, 0.850652, 0.000000, 0.000000, 1.000000,
0.162456, -0.499995, 0.850654, 0.688189, -0.499997, 0.525736, 0.525730, 0.000000, 0.850652,
0.688189, -0.499997, 0.525736, 0.894426, 0.000000, 0.447216, 0.525730, 0.000000, 0.850652,
0.951058, 0.309013, 0.000000, 0.688189, 0.499997, 0.525736, 0.894426, 0.000000, 0.447216,
0.951058, 0.309013, 0.000000, 0.587786, 0.809017, 0.000000, 0.688189, 0.499997, 0.525736,
0.587786, 0.809017, 0.000000, 0.276388, 0.850649, 0.447220, 0.688189, 0.499997, 0.525736,
0.000000, 1.000000, 0.000000, -0.262869, 0.809012, 0.525738, 0.276388, 0.850649, 0.447220,
0.000000, 1.000000, 0.000000, -0.587786, 0.809017, 0.000000, -0.262869, 0.809012, 0.525738,
-0.587786, 0.809017, 0.000000, -0.723607, 0.525725, 0.447220, -0.262869, 0.809012, 0.525738,
-0.951058, 0.309013, 0.000000, -0.850648, 0.000000, 0.525736, -0.723607, 0.525725, 0.447220,
-0.951058, 0.309013, 0.000000, -0.951058, -0.309013, 0.000000, -0.850648, 0.000000, 0.525736,
-0.951058, -0.309013, 0.000000, -0.723607, -0.525725, 0.447220, -0.850648, 0.000000, 0.525736,
-0.587786, -0.809017, 0.000000, -0.262869, -0.809012, 0.525738, -0.723607, -0.525725, 0.447220,
-0.587786, -0.809017, 0.000000, 0.000000, -1.000000, 0.000000, -0.262869, -0.809012, 0.525738,
0.000000, -1.000000, 0.000000, 0.276388, -0.850649, 0.447220, -0.262869, -0.809012, 0.525738,
0.587786, -0.809017, 0.000000, 0.688189, -0.499997, 0.525736, 0.276388, -0.850649, 0.447220,
0.587786, -0.809017, 0.000000, 0.951058, -0.309013, 0.000000, 0.688189, -0.499997, 0.525736,
0.951058, -0.309013, 0.000000, 0.894426, 0.000000, 0.447216, 0.688189, -0.499997, 0.525736,
0.587786, 0.809017, 0.000000, 0.000000, 1.000000, 0.000000, 0.276388, 0.850649, 0.447220,
0.587786, 0.809017, 0.000000, 0.262869, 0.809012, -0.525738, 0.000000, 1.000000, 0.000000,
0.262869, 0.809012, -0.525738, -0.276388, 0.850649, -0.447220, 0.000000, 1.000000, 0.000000,
-0.587786, 0.809017, 0.000000, -0.951058, 0.309013, 0.000000, -0.723607, 0.525725, 0.447220,
-0.587786, 0.809017, 0.000000, -0.688189, 0.499997, -0.525736, -0.951058, 0.309013, 0.000000,
-0.688189, 0.499997, -0.525736, -0.894426, 0.000000, -0.447216, -0.951058, 0.309013, 0.000000,
-0.951058, -0.309013, 0.000000, -0.587786, -0.809017, 0.000000, -0.723607, -0.525725, 0.447220,
-0.951058, -0.309013, 0.000000, -0.688189, -0.499997, -0.525736, -0.587786, -0.809017, 0.000000,
-0.688189, -0.499997, -0.525736, -0.276388, -0.850649, -0.447220, -0.587786, -0.809017, 0.000000,
0.000000, -1.000000, 0.000000, 0.587786, -0.809017, 0.000000, 0.276388, -0.850649, 0.447220,
0.000000, -1.000000, 0.000000, 0.262869, -0.809012, -0.525738, 0.587786, -0.809017, 0.000000,
0.262869, -0.809012, -0.525738, 0.723607, -0.525725, -0.447220, 0.587786, -0.809017, 0.000000,
0.951058, -0.309013, 0.000000, 0.951058, 0.309013, 0.000000, 0.894426, 0.000000, 0.447216,
0.951058, -0.309013, 0.000000, 0.850648, 0.000000, -0.525736, 0.951058, 0.309013, 0.000000,
0.850648, 0.000000, -0.525736, 0.723607, 0.525725, -0.447220, 0.951058, 0.309013, 0.000000,
0.425323, 0.309011, -0.850654, 0.262869, 0.809012, -0.525738, 0.723607, 0.525725, -0.447220,
0.425323, 0.309011, -0.850654, -0.162456, 0.499995, -0.850654, 0.262869, 0.809012, -0.525738,
-0.162456, 0.499995, -0.850654, -0.276388, 0.850649, -0.447220, 0.262869, 0.809012, -0.525738,
-0.162456, 0.499995, -0.850654, -0.688189, 0.499997, -0.525736, -0.276388, 0.850649, -0.447220,
-0.162456, 0.499995, -0.850654, -0.525730, 0.000000, -0.850652, -0.688189, 0.499997, -0.525736,
-0.525730, 0.000000, -0.850652, -0.894426, 0.000000, -0.447216, -0.688189, 0.499997, -0.525736,
-0.525730, 0.000000, -0.850652, -0.688189, -0.499997, -0.525736, -0.894426, 0.000000, -0.447216,
-0.525730, 0.000000, -0.850652, -0.162456, -0.499995, -0.850654, -0.688189, -0.499997, -0.525736,
-0.162456, -0.499995, -0.850654, -0.276388, -0.850649, -0.447220, -0.688189, -0.499997, -0.525736,
0.850648, 0.000000, -0.525736, 0.425323, 0.309011, -0.850654, 0.723607, 0.525725, -0.447220,
0.850648, 0.000000, -0.525736, 0.425323, -0.309011, -0.850654, 0.425323, 0.309011, -0.850654,
0.425323, -0.309011, -0.850654, 0.000000, 0.000000, -1.000000, 0.425323, 0.309011, -0.850654,
-0.162456, -0.499995, -0.850654, 0.262869, -0.809012, -0.525738, -0.276388, -0.850649, -0.447220,
-0.162456, -0.499995, -0.850654, 0.425323, -0.309011, -0.850654, 0.262869, -0.809012, -0.525738,
0.425323, -0.309011, -0.850654, 0.723607, -0.525725, -0.447220, 0.262869, -0.809012, -0.525738,
];
const meshVerts = new Float32Array(verts);
const vertsLenght = meshVerts.length / 3;
gl.uniform1i(uLvertices, vertsLenght);
gl.pixelStorei(gl.UNPACK_ALIGNMENT, 1);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB32F, vertsLenght, 1, 0, gl.RGB, gl.FLOAT, meshVerts);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
// mouse click
let mousePosition = [0, 0];
gl.canvas.addEventListener('mousemove', (e) => {
if (!e.buttons) return;
if (e.buttons == 1) mousePosition = [e.clientX * .01, e.clientY * .01];
}, !1);
// animation
const draw = (clock) => {
clock *= 0.001;
gl.viewport(0.0, 0.0, gl.drawingBufferWidth, gl.drawingBufferHeight);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.uniform1i(uLSr, 0);
gl.uniform1f(time_loc, clock);
gl.uniform2f(mouse_loc, mousePosition[0], mousePosition[1]);
gl.uniform2f(res_loc, width, height);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 3);
requestAnimationFrame(draw);
};
requestAnimationFrame(draw);
})()<canvas id="c"></canvas>