rg3d 0.21.0

3D Game engine
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#version 330 core

uniform sampler2D diffuseTexture;
uniform vec3 lightPosition;

in vec2 texCoord;
in vec3 worldPosition;

layout(location = 0) out float depth;

void main()
{
    if (texture(diffuseTexture, texCoord).a < 0.2) discard;
    depth = length(lightPosition - worldPosition);
}