LYGIA Shader Library

Use:

<float> triPrismSDF( in <vec3> pos, in <vec2> h )

Check it on Github

#ifndef FNC_TRIPRISMSDF
#define FNC_TRIPRISMSDF

float triPrismSDF( vec3 p, vec2 h ) {
    vec3 q = abs(p);
    return max(q.z-h.y,max(q.x*0.866025+p.y*0.5,-p.y)-h.x*0.5);
}

// float triPrismSDF( vec3 p, vec2 h ) {
//     const float k = sqrt(3.0);
//     h.x *= 0.5*k;
//     p.xy /= h.x;
//     p.x = abs(p.x) - 1.0;
//     p.y = p.y + 1.0/k;
//     if( p.x+k*p.y>0.0 ) p.xy=vec2(p.x-k*p.y,-k*p.x-p.y)/2.0;
//     p.x -= clamp( p.x, -2.0, 0.0 );
//     float d1 = length(p.xy)*sign(-p.y)*h.x;
//     float d2 = abs(p.z)-h.y;
//     return length(max(vec2(d1,d2),0.0)) + min(max(d1,d2), 0.);
// }


#endif

Use:

<float> triPrismSDF( in <float3> pos, in <float2> h )

Check it on Github

#ifndef FNC_TRIPRISMSDF
#define FNC_TRIPRISMSDF

float triPrismSDF( float3 p, float2 h ) {
    float3 q = abs(p);
    return max(q.z-h.y,max(q.x*0.866025+p.y*0.5,-p.y)-h.x*0.5);
}

// float triPrismSDF( float3 p, float2 h ) {
//     const float k = sqrt(3.0);
//     h.x *= 0.5*k;
//     p.xy /= h.x;
//     p.x = abs(p.x) - 1.0;
//     p.y = p.y + 1.0/k;
//     if( p.x+k*p.y>0.0 ) p.xy=float2(p.x-k*p.y,-k*p.x-p.y)/2.0;
//     p.x -= clamp( p.x, -2.0, 0.0 );
//     float d1 = length(p.xy)*sign(-p.y)*h.x;
//     float d2 = abs(p.z)-h.y;
//     return length(max(float2(d1,d2),0.0)) + min(max(d1,d2), 0.);
// }


#endif

Use:

<float> triPrismSDF( <float3> pos, <float2> h )

Check it on Github

#ifndef FNC_TRIPRISMSDF
#define FNC_TRIPRISMSDF

float triPrismSDF( float3 p, float2 h ) {
    float3 q = abs(p);
    return max(q.z-h.y,max(q.x*0.866025+p.y*0.5,-p.y)-h.x*0.5);
}

// float triPrismSDF( float3 p, float2 h ) {
//     const float k = sqrt(3.0);
//     h.x *= 0.5*k;
//     p.xy /= h.x;
//     p.x = abs(p.x) - 1.0;
//     p.y = p.y + 1.0/k;
//     if( p.x+k*p.y>0.0 ) p.xy=float2(p.x-k*p.y,-k*p.x-p.y)/2.0;
//     p.x -= clamp( p.x, -2.0, 0.0 );
//     float d1 = length(p.xy)*sign(-p.y)*h.x;
//     float d2 = abs(p.z)-h.y;
//     return length(max(float2(d1,d2),0.0)) + min(max(d1,d2), 0.);
// }


#endif