@jscad/regl-renderer/src/rendering/commands/drawLines/meshShaders.js

Renderer for JSCAD Geometries

const meshVert = `
precision mediump float;

uniform float camNear, camFar;
uniform mat4 model, view, projection;

attribute vec3 position, normal;


varying vec3 surfaceNormal, surfacePosition;
varying vec4 _worldSpacePosition;


void main() {


  surfacePosition = position;
  surfaceNormal = normal;
  vec4 worldSpacePosition = model * vec4(position, 1);
  _worldSpacePosition = worldSpacePosition;

  vec4 glPosition = projection * view * model * vec4(position, 1);
  gl_Position = glPosition;
}
`

const meshFrag = `
precision mediump float;
varying vec3 surfaceNormal;
uniform float ambientLightAmount;
uniform float diffuseLightAmount;
uniform vec4 ucolor;
uniform vec3 lightDirection;
uniform vec3 opacity;

varying vec4 _worldSpacePosition;

uniform vec2 printableArea;

vec4 errorColor = vec4(0.15, 0.15, 0.15, 0.3);

void main () {
  vec4 depth = gl_FragCoord;

  float v = 0.8; // shadow value
  vec4 endColor = ucolor;

  vec3 ambient = ambientLightAmount * endColor.rgb;
  float cosTheta = dot(surfaceNormal, lightDirection);
  vec3 diffuse = diffuseLightAmount * endColor.rgb * clamp(cosTheta , 0.0, 1.0 );

  float cosTheta2 = dot(surfaceNormal, vec3(-lightDirection.x, -lightDirection.y, lightDirection.z));
  vec3 diffuse2 = diffuseLightAmount * endColor.rgb * clamp(cosTheta2 , 0.0, 1.0 );

  gl_FragColor = vec4((ambient + diffuse + diffuse2 * v), endColor.a);
}`

module.exports = { vert: meshVert, frag: meshFrag }