source: java/client_3D/static/shared/res/shaders/old_stone.glsl @ 65

//name stone
//vert
        
varying vec2 texCoord;
varying vec3 normalVec; 

void main(void)
{
        gl_Position = ftransform();
        texCoord = gl_MultiTexCoord0.xy * 0.4;
        normalVec = normalize(gl_NormalMatrix * gl_Normal);
}
        
//frag

varying vec2 texCoord;
uniform sampler2D diffuseMap;
varying vec3 normalVec;

void main (void)
{
        vec4 base = texture2D(diffuseMap, texCoord);
        
        float c = dot(normalVec, vec3(0,0,-1));
        c = abs(c);
        gl_FragColor = base * (1.0-c);
}