30 lines
No EOL
777 B
Text
30 lines
No EOL
777 B
Text
shader_type spatial;
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render_mode cull_disabled;
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vec4 polygon(vec2 uv, float width, int sides)
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{
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// UV goes from [0 , 1], we multiply by two ( [0, 2] ) and subtract one [ -1, 1]
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// So the range is centered
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uv = uv * 2.0 - 1.0;
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// Get the angle from the point to the center, starting with 0 at the middle left side
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float angle = atan(uv.x, uv.y);
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float radius = TAU / float(sides);
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float dist = cos(floor(0.5 + angle / radius) * radius - angle) * length(uv);
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float poly = step(width, dist);
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return vec4(vec3(poly), 1.0);
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}
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void fragment() {
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// Multiply [0, 1] range of sine to [0, 7]
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float side_value = 7.0 * sin(TIME);
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// shift the value to half = [3, 10]
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side_value = side_value + 3.0;
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ALBEDO = vec3(polygon(UV, 0.3, clamp(int(side_value), 3, 9)).rgb);
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} |