将着色玩具转移到TouchDesigner

Question

我要把一些openGL从着色玩具转到TouchDesigner里。我认为问题在于“使用未声明的标识符'wave'”，因为我已经做了最明显的调整。

layout(location = 0) out vec4 fragColor;

uniform vec2 iResolution;
uniform float iTime;
uniform vec4 iMouse;

float material;
float rng;

float map (vec3 p)
{
    // time stretched with noise
    float t = iTime*1. + rng*0.9;
    
    // domain repetition
    float grid = 5.;
    vec3 cell = floor(p/grid);
    p = repeat(p,grid);
    
    // distance from origin
    float dp = length(p);
    
    // rotation parameter
    vec3 angle = vec3(.1,-.5,.1) + dp*.5 + p*.1 + cell;
    
    // shrink sphere size
    float size = sin(rng*3.14);
    
    // stretch sphere
    float wave = sin(-dp*1.+t+hash13(cell)*6.28)*.5;
    
    // kaleidoscopic iterated function
    const int count = 4;
    float a = 1.0;
    float scene = 1000.;
    float shape = 1000.;
    for (int index = 0; index < count; ++index)
    {
        // fold and translate
        p.xz = abs(p.xz)-(.5+wave)*a;
        
        // rotate
        p.xz *= rot(angle.y/a);
        p.yz *= rot(angle.x/a);
        p.yx *= rot(angle.z/a);
        
        // sphere
        shape = length(p)-0.2*a*size;
        
        // material blending
        material = mix(material, float(index), smoothing(shape, scene, 0.3*a));
        
        // add with a blend
        scene = smin(scene, shape, 1.*a);
        
        // falloff transformations
        a /= 1.9;
    }
        
    return scene;
}

// return color from pixel coordinate
void main()
{
    // reset color
    fragColor = vec4(0,0,0,1);
    material = 0.0;
    
    // camera coordinates
    vec2 uv = (gl_FragCoord.xy - iResolution.xy * 0.5) / iResolution.y;
    vec3 eye = vec3(1,1,1.);
    vec3 at = vec3(0,0,0);
    vec3 z = normalize(at-eye);
    vec3 x = normalize(cross(z, vec3(0,1,0)));
    vec3 y = cross(x, z);
    vec3 ray = normalize(vec3(z + uv.x * x + uv.y * y));
    vec3 pos = eye;
    
    // camera control
    vec2 M = 6.28*(iMouse.xy-.5);
    ray.xz *= rot(M.x), pos.xz *= rot(M.x);
    ray.xy *= rot(M.y), pos.xy *= rot(M.y);
    
    // white noise
    vec3 seed = vec3(gl_FragCoord.xy, iTime);
    rng = hash13(seed);
    
    // raymarch
    const float steps = 30.0;
    float index;
    for (index = steps; index > 0.0; --index)
    {
        // volume estimation
        float dist = map(pos);
        if (dist < 0.01)
        {
            break;
        }
        
        // dithering
        dist *= 0.9 + .1 * rng;
        
        // raymarch
        pos += ray * dist;
    }
    
    // ambient occlusion from steps count
    float shade = index/steps;

    // compute normal by NuSan (https://www.shadertoy.com/view/3sBGzV)
    vec2 off=vec2(.001,0);
    vec3 normal = normalize(map(pos)-vec3(map(pos-off.xyy), map(pos-off.yxy), map(pos-off.yyx)));

    // Inigo Quilez color palette (https://iquilezles.org/www/articles/palettes/palettes.htm)
    vec3 tint = .5+.5*cos(vec3(3,2,1)+material*.5+length(pos)*.5);

    // lighting
    float ld = dot(reflect(ray, normal), vec3(0,1,0))*0.5+0.5;
    vec3 light = vec3(1.000,0.502,0.502) * sqrt(ld);
    ld = dot(reflect(ray, normal), vec3(0,0,-1))*0.5+0.5;
    light += vec3(0.400,0.714,0.145) * sqrt(ld)*.5;

    // pixel color
    fragColor.rgb = (tint + light) * shade;

    // temporal buffer
    fragColor = max(fragColor, texture(sTD2DInputs[0], gl_FragCoord.xy/iResolution.xy) - 0.01);
}

像素阴影编译结果：

ERROR: 0:26: Invalid call of undeclared identifier 'repeat'
ERROR: 0:38: Invalid call of undeclared identifier 'hash13'
ERROR: 0:48: Use of undeclared identifier 'wave'
ERROR: 0:51: Invalid call of undeclared identifier 'rot'
ERROR: 0:52: Invalid call of undeclared identifier 'rot'
ERROR: 0:53: Invalid call of undeclared identifier 'rot'
ERROR: 0:59: Invalid call of undeclared identifier 'smoothing'
ERROR: 0:62: Invalid call of undeclared identifier 'smin'
ERROR: 0:90: Invalid call of undeclared identifier 'rot'
ERROR: 0:90: Invalid call of undeclared identifier 'rot'
ERROR: 0:91: Invalid call of undeclared identifier 'rot'
ERROR: 0:91: Invalid call of undeclared identifier 'rot'
ERROR: 0:95: Invalid call of undeclared identifier 'hash13'

Answer 1

如果您正在尝试运行这是着色器，请注意它使用的是一个缓冲区(两次传递)，而该缓冲区可能漏掉了。

看一下这段视频，在下半部分显示处理一个使用缓冲区(类似于您的)的着色玩具着色器。