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| -rw-r--r-- | src/main.zig | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/main.zig b/src/main.zig index aa0fa3c..e615e8b 100644 --- a/src/main.zig +++ b/src/main.zig @@ -421,6 +421,50 @@ fn randomReal(rand: std.rand.Random, min: f64, max: f64) f64 { return min + randomReal01(rand) * (max - min); } +const Aabb = struct { + min: Point3, + max: Point3, + + fn hit(aabb: Aabb, r: Ray, tMin: f64, tMax: f64) bool { + var tMin_ = tMin; + var tMax_ = tMax; + { + const s0 = (aabb.min.x - r.origin.x) / r.dir.x; + const s1 = (aabb.max.x - r.origin.x) / r.dir.x; + const t0 = @min(s0, s1); + const t1 = @max(s0, s1); + tMin_ = @max(t0, tMin_); + tMax_ = @min(t1, tMax_); + if (tMax_ <= tMin_) { + return false; + } + } + { + const s0 = (aabb.min.y - r.origin.y) / r.dir.y; + const s1 = (aabb.max.y - r.origin.y) / r.dir.y; + const t0 = @min(s0, s1); + const t1 = @max(s0, s1); + tMin_ = @max(t0, tMin_); + tMax_ = @min(t1, tMax_); + if (tMax_ <= tMin_) { + return false; + } + } + { + const s0 = (aabb.min.z - r.origin.z) / r.dir.z; + const s1 = (aabb.max.z - r.origin.z) / r.dir.z; + const t0 = @min(s0, s1); + const t1 = @max(s0, s1); + tMin_ = @max(t0, tMin_); + tMax_ = @min(t1, tMax_); + if (tMax_ <= tMin_) { + return false; + } + } + return true; + } +}; + const Camera = struct { origin: Point3, horizontal: Vec3, |