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#version 330
uniform mat4 modelViewMatrix;
uniform mat4 normalMatrix;
uniform mat4 projectionMatrix;
uniform float thickness;
layout(location = 0) in vec3 vertex;
layout(location = 1) in vec3 normal;
layout(location = 2) in vec3 leftNormal;
layout(location = 3) in vec3 rightNormal;
void main() {
vec3 p = (modelViewMatrix * vec4(vertex,1)).xyz;
vec3 e = -p;
vec3 nl = (normalMatrix * vec4(leftNormal,0)).xyz;
vec3 nr = (normalMatrix * vec4(rightNormal,0)).xyz;
vec3 v = vertex;
if (dot(e,nl) * dot(e,nr) < 0.0) {
v += thickness*normal;
}
gl_Position = projectionMatrix * modelViewMatrix * vec4(v,1);
}
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