LYGIA Shader Library

Dependencies:

• lygia/lighting/raymarch/map.glsl

Use:

<float> raymarchNormal( in <vec3> pos )

Check it on Github

#ifndef RAYMARCH_NORMAL_OFFSET
#define RAYMARCH_NORMAL_OFFSET 0.0001
#endif

#ifndef FNC_RAYMARCH_NORMAL
#define FNC_RAYMARCH_NORMAL

vec3 raymarchNormal(vec3 pos, vec2 pixel) {
   vec2 offset = vec2(1.0, -1.0) * pixel;
   return normalize( offset.xyy * RAYMARCH_MAP_FNC( pos + offset.xyy ).sdf +
                     offset.yyx * RAYMARCH_MAP_FNC( pos + offset.yyx ).sdf +
                     offset.yxy * RAYMARCH_MAP_FNC( pos + offset.yxy ).sdf +
                     offset.xxx * RAYMARCH_MAP_FNC( pos + offset.xxx ).sdf );
}

vec3 raymarchNormal(vec3 pos, float e) {
   vec2 offset = vec2(1.0, -1.0) * e;
   return normalize( offset.xyy * RAYMARCH_MAP_FNC( pos + offset.xyy ).sdf +
                     offset.yyx * RAYMARCH_MAP_FNC( pos + offset.yyx ).sdf +
                     offset.yxy * RAYMARCH_MAP_FNC( pos + offset.yxy ).sdf +
                     offset.xxx * RAYMARCH_MAP_FNC( pos + offset.xxx ).sdf );
}

vec3 raymarchNormal( in vec3 pos ) {
   return raymarchNormal(pos, RAYMARCH_NORMAL_OFFSET);
}

#endif

Dependencies:

• lygia/lighting/raymarch/map.glsl

Use:

<float> raymarchNormal( in <float3> pos )

Check it on Github

#ifndef RAYMARCH_NORMAL_OFFSET
#define RAYMARCH_NORMAL_OFFSET 0.0001
#endif

#ifndef FNC_RAYMARCH_NORMAL
#define FNC_RAYMARCH_NORMAL

float3 raymarchNormal(float3 pos, float2 pixel) {
   float2 offset = float2(1.0, -1.0) * pixel;
   return normalize( offset.xyy * RAYMARCH_MAP_FNC(pos + offset.xyy).sdf +
                     offset.yyx * RAYMARCH_MAP_FNC(pos + offset.yyx).sdf +
                     offset.yxy * RAYMARCH_MAP_FNC(pos + offset.yxy).sdf +
                     offset.xxx * RAYMARCH_MAP_FNC(pos + offset.xxx).sdf);
}

float3 raymarchNormal(float3 pos, float e) {
   const float2 offset = float2(1.0, -1.0) * e;
    return normalize(offset.xyy * RAYMARCH_MAP_FNC(pos + offset.xyy).sdf +
                     offset.yyx * RAYMARCH_MAP_FNC(pos + offset.yyx).sdf +
                     offset.yxy * RAYMARCH_MAP_FNC(pos + offset.yxy).sdf +
                     offset.xxx * RAYMARCH_MAP_FNC(pos + offset.xxx).sdf);
}

float3 raymarchNormal( in float3 pos ) {
   return raymarchNormal(pos, RAYMARCH_NORMAL_OFFSET);
}

#endif

Check it on Github

// #include "map.wgls"

fn raymarchNormal( pos: vec3f ) -> vec3f {
    let eps = 0.002;
    let v1 = vec3f( 1.0,-1.0,-1.0);
    let v2 = vec3f(-1.0,-1.0, 1.0);
    let v3 = vec3f(-1.0, 1.0,-1.0);
    let v4 = vec3f( 1.0, 1.0, 1.0);
    return normalize( v1 * map( pos + v1 * eps ) + 
                      v2 * map( pos + v2 * eps ) + 
                      v3 * map( pos + v3 * eps ) + 
                      v4 * map( pos + v4 * eps ) );
}

Dependencies:

• lygia/math/make.glsl
• lygia/math/normalize.glsl
• lygia/lighting/raymarch/map.glsl

Use:

<float> raymarchNormal( in <float3> pos )

Check it on Github

#ifndef RAYMARCH_MAP_FNC
#define RAYMARCH_MAP_FNC(POS) raymarchMap(POS)
#endif

#ifndef RAYMARCH_MAP_DISTANCE
#define RAYMARCH_MAP_DISTANCE w
#endif

#ifndef FNC_RAYMARCH_NORMAL
#define FNC_RAYMARCH_NORMAL

inline __host__ __device__ float3 raymarchNormal(const float3& pos, float2 pixel) {
   float2 offset = make_float2(1.0f, -1.0f) * pixel;
   float3 offset_xyy = make_float3(offset.x, offset.y, offset.y);
   float3 offset_yyx = make_float3(offset.y, offset.y, offset.x);
   float3 offset_yxy = make_float3(offset.y, offset.x, offset.y);
   float3 offset_xxx = make_float3(offset.x, offset.x, offset.x);
   return normalize( offset_xyy * RAYMARCH_MAP_FNC( pos + offset_xyy ).RAYMARCH_MAP_DISTANCE +
                     offset_yyx * RAYMARCH_MAP_FNC( pos + offset_yyx ).RAYMARCH_MAP_DISTANCE +
                     offset_yxy * RAYMARCH_MAP_FNC( pos + offset_yxy ).RAYMARCH_MAP_DISTANCE +
                     offset_xxx * RAYMARCH_MAP_FNC( pos + offset_xxx ).RAYMARCH_MAP_DISTANCE );
}

inline __host__ __device__ float3 raymarchNormal(const float3& pos, float e) {
   const float2 offset = make_float2(1.0f, -1.0f) * e;
   float3 offset_xyy = make_float3(offset.x, offset.y, offset.y);
   float3 offset_yyx = make_float3(offset.y, offset.y, offset.x);
   float3 offset_yxy = make_float3(offset.y, offset.x, offset.y);
   float3 offset_xxx = make_float3(offset.x, offset.x, offset.x);
   return normalize( offset_xyy * RAYMARCH_MAP_FNC( pos + offset_xyy ).RAYMARCH_MAP_DISTANCE +
                     offset_yyx * RAYMARCH_MAP_FNC( pos + offset_yyx ).RAYMARCH_MAP_DISTANCE +
                     offset_yxy * RAYMARCH_MAP_FNC( pos + offset_yxy ).RAYMARCH_MAP_DISTANCE +
                     offset_xxx * RAYMARCH_MAP_FNC( pos + offset_xxx ).RAYMARCH_MAP_DISTANCE );
}

inline __host__ __device__ float3 raymarchNormal(const float3& pos) {
    return raymarchNormal(pos, 0.5773f * 0.0005f);
}


#endif