diff options
Diffstat (limited to 'Shaders')
| -rw-r--r-- | Shaders/ray_march.cginc | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/Shaders/ray_march.cginc b/Shaders/ray_march.cginc index d40286a..b83722c 100644 --- a/Shaders/ray_march.cginc +++ b/Shaders/ray_march.cginc @@ -62,19 +62,25 @@ float distance_from_rect_pyramid_frame(float3 p, float dx, float dy, float h, fl { float3 p0 = float3(dx/2, dy/2, 0); float3 p1 = float3(dx/2, -dy/2, 0); - float3 p2 = float3(-dx/2, -dy/2, 0); float3 p3 = float3(-dx/2, dy/2, 0); float3 p4 = float3(skew, 0, h); + float3 pp = p; + // Symmetry + pp.x = abs(pp.x); + float d01 = distance_from_line_segment(pp, p0, p1, e); + + pp = p; + pp.y = abs(pp.y); + float d03 = distance_from_line_segment(pp, p0, p3, e); + float d04 = distance_from_line_segment(pp, p0, p4, e); + float d14 = distance_from_line_segment(pp, p3, p4, e); + float dist = 1000; - dist = min(dist, distance_from_line_segment(p, p0, p1, e)); - dist = min(dist, distance_from_line_segment(p, p1, p2, e)); - dist = min(dist, distance_from_line_segment(p, p2, p3, e)); - dist = min(dist, distance_from_line_segment(p, p3, p0, e)); - dist = min(dist, distance_from_line_segment(p, p0, p4, e)); - dist = min(dist, distance_from_line_segment(p, p1, p4, e)); - dist = min(dist, distance_from_line_segment(p, p2, p4, e)); - dist = min(dist, distance_from_line_segment(p, p3, p4, e)); + dist = min(dist, d01); + dist = min(dist, d04); + dist = min(dist, d03); + dist = min(dist, d14); return dist; } |