LYGIA Shader Library

Dependencies:

• lygia/sample/2DCube.glsl
• lygia/space/scale.glsl
• lygia/sdf/boxSDF.glsl
• lygia/sdf/opIntersection.glsl

Use:

<vecSAMPLE3DSDF_TYPE4> sample3DSdf(in <SAMPLER_TYPE> lut, in <vec3> xyz)

Check it on Github

#ifndef SAMPLE3DSDF_TYPE
#define SAMPLE3DSDF_TYPE float
#endif

#ifndef SAMPLE3DSDF_FNC
#define SAMPLE3DSDF_FNC(TEX, POS) sample2DCube(TEX, POS).r
#endif

#ifndef FNC_SAMPLE3DSDF
#define FNC_SAMPLE3DSDF
SAMPLE3DSDF_TYPE sample3DSdf(SAMPLER_TYPE tex, vec3 pos) {
    pos += 0.5;
    pos = scale(pos, 0.5);
    SAMPLE3DSDF_TYPE sdf = (SAMPLE3DSDF_FNC(tex, pos) * 2.0 - 1.0) * 1.5;
    return opIntersection( boxSDF(pos - 0.5, vec3(0.5)), sdf);
}
#endif

Dependencies:

• lygia/sample/2DCube.glsl
• lygia/space/scale.glsl
• lygia/sdf/boxSDF.glsl
• lygia/sdf/opIntersection.glsl

Check it on Github

#ifndef FNC_SAMPLE3DSDF
#define FNC_SAMPLE3DSDF
float sample3DSdf(SAMPLER_TYPE tex, float3 pos) {
    pos += .5;
    pos = scale(pos, .5);
    float sdf = (sample2DCube(tex, pos).r * 2.0 - 1.0) * 1.5;
    return opIntersection( boxSDF(pos - 0.5, float3(.5, .5, .5)), sdf);
}
#endif