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package main
import (
maths "math"
)
type Ray struct {
Origin Vec3
Direction Vec3
Valid bool
}
func (r Ray) At(t float64) Vec3 {
return r.Origin.Add(r.Direction.Mul(SplatVec3(t)));
}
func (r Ray) Colour(world Hittable, md uint) Vec3 {
if md <= 0 {
return SplatVec3(0);
}
hit := world.Hit(r, Interval{0.001, maths.Inf(1)})
if hit.Valid {
scat := hit.Mat.Scatter(r, hit);
if scat.Valid {
return scat.Colour(world, md - 1).Mul(hit.Mat.Attenuation());
}
return SplatVec3(0);
}
unit_dir := r.Direction.Unit();
a := (unit_dir.Y + 1) / 2;
return Vec3{0.5, 0.7, 1.0}.Mul(SplatVec3(a)).
Add(SplatVec3(1).Mul(SplatVec3(1.0 - a)));
}
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