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Subtract mode error #12

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xiaozhuai opened this issue Jul 19, 2022 · 0 comments

xiaozhuai commented Jul 19, 2022

Subtract is not as same as LinearBurn

Subtract should be

float blendSubtract(float base, float blend) {
    return max(base-blend, 0.0);
}

vec3 blendSubtract(vec3 base, vec3 blend) {
    return max(base-blend, vec3(0.0));
}

vec3 blendSubtract(vec3 base, vec3 blend, float opacity) {
	return (blendSubtract(base, blend) * opacity + base * (1.0 - opacity));
}

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