lygia
/sdf
/opSubtraction
)Substraction operation of two SDFs
Dependencies:
Use:
<float> opSubstraction( in <float> d1, in <float> d2 [, <float> smooth_factor])
#ifndef FNC_OPSUBSTRACTION
#define FNC_OPSUBSTRACTION
float opSubtraction( float d1, float d2 ) { return max(-d1, d2); }
vec4 opSubtraction( vec4 d1, vec4 d2 ) { return (-d1.a > d2.a) ? -d1 : d2; }
float opSubtraction( float d1, float d2, float k ) {
float h = clamp( 0.5 - 0.5*(d2+d1)/k, 0.0, 1.0 );
return mix( d2, -d1, h ) + k*h*(1.0-h);
}
vec4 opSubtraction( vec4 d1, vec4 d2, float k ) {
float h = clamp( 0.5 - 0.5*(d2.a+d1.a)/k, 0.0, 1.0 );
vec4 result = mix( d2, -d1, h );
result.a += k*h*(1.0-h);
return result;
}
#endif
Use:
<float> opSubstraction( in <float> d1, in <float> d2 [, <float> smooth_factor])
#ifndef FNC_OPSUBSTRACTION
#define FNC_OPSUBSTRACTION
float opSubtraction( float d1, float d2 ) { return max(-d1,d2); }
float opSubtraction( float d1, float d2, float k ) {
float h = saturate( 0.5 - 0.5*(d2+d1)/k );
return lerp( d2, -d1, h ) + k*h*(1.0-h);
}
#endif
Dependencies:
Use:
<float> opSubstraction( <float> d1, <float> d2 [, <float> smooth_factor])
#ifndef FNC_OPSUBSTRACTION
#define FNC_OPSUBSTRACTION
float opSubtraction( float d1, float d2 ) { return max(-d1, d2); }
float4 opSubtraction( float4 d1, float4 d2 ) { return (-d1.a > d2.a) ? -d1 : d2; }
float opSubtraction( float d1, float d2, float k ) {
float h = clamp( 0.5 - 0.5*(d2+d1)/k, 0.0, 1.0 );
return mix( d2, -d1, h ) + k*h*(1.0-h);
}
float4 opSubtraction( float4 d1, float4 d2, float k ) {
float h = clamp( 0.5 - 0.5*(d2.a+d1.a)/k, 0.0, 1.0 );
return mix( d2, -d1, h ) + k*h*(1.0-h);
}
#endif
fn opSubtraction( d1: f32, d2: f32 )-> f32 { return max(-d1, d2); }
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