lygia/sample/3DSdf)Use a 2D texture as to encode a 3D SDF (Signed Distance Field) function
Dependencies:
Use:
<vecSAMPLE3DSDF_TYPE4> sample3DSdf(in <SAMPLER_TYPE> lut, in <vec3> xyz)
#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:
Use:
<vecSAMPLE3DSDF_TYPE4> sample3DSdf(in <SAMPLER_TYPE> lut, in <float3> xyz)
#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, float3 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, float3(0.5, 0.5, 0.5)), sdf);
}
#endif
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