glslViewer Shader: extrussion

extrussion.json

{
  "frag": "#ifdef GL_ES\nprecision mediump float;\n#endif\n\nuniform sampler2D   u_tex0;\nuniform vec2        u_tex0Resolution;\n\nuniform float \t\tu_time;\nuniform vec2 \t\tu_resolution;\nvarying vec4 \t\tv_color;\nvarying vec2 \t\tv_texcoord;\n\nvoid main() {\n    vec4 color = v_color;\n    vec2 pixel = 1.0/u_resolution;\n    vec2 st = gl_FragCoord.xy * pixel;\n    vec2 uv = v_texcoord;\n\n    gl_FragColor = color;\n}\n",
  "vert": "#ifdef GL_ES\nprecision mediump float;\n#endif\n\nuniform sampler2D   u_tex0;\nuniform vec2        u_tex0Resolution;\n\nuniform mat4        u_modelMatrix;\nuniform mat4        u_viewMatrix;\nuniform mat4        u_projectionMatrix;\nuniform mat4        u_modelViewProjectionMatrix;\n\nuniform vec2 \t\tu_resolution;\n\nattribute vec4 \t\ta_position;\nvarying vec4 \t\tv_position;\nvarying vec4 \t\tv_color;\nvarying vec2 \t\tv_texcoord;\n\n#include \"lygia/color/luma.glsl\"\n#include \"lygia/space/ratio.glsl\"\n#include \"lygia/sample/zero.glsl\"\n\nvoid main() {\n    v_position = a_position;\n    v_position.xy -= 0.5;\n    v_texcoord = a_position.xy;\n    \n    vec2 uv = v_texcoord;\n    uv = ratio(uv, u_resolution); \n  \tuv = ratio(uv, u_tex0Resolution.yx);\n\n    v_color = sampleZero(u_tex0, uv);\n    \n    v_position.z = luma(v_color) - 0.5;\n    \n    gl_Position = u_projectionMatrix * u_viewMatrix * v_position;\n}\n",
  "commands": [
    "camera_position,-0.203636,-0.133611,-1.15488",
    "camera_look_at,0,0,0",
    "textures,on"
  ],
  "assets": {