From ae3931e79613449e47349730b8359f1ae8e4594d Mon Sep 17 00:00:00 2001
From: Antoine Martin <antoine97.martin@gmail.com>
Date: Sat, 9 May 2020 02:05:12 +0200
Subject: [PATCH] library: render: don't return infinite weight

hemisphere sampling previously could return infinite, producing NaNs
when later multiplying that weight by 0.
---
 pathtracer/src/render/utils.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pathtracer/src/render/utils.rs b/pathtracer/src/render/utils.rs
index 18c5755..1fdbaf6 100644
--- a/pathtracer/src/render/utils.rs
+++ b/pathtracer/src/render/utils.rs
@@ -101,7 +101,7 @@ pub fn sample_hemisphere(normal: Unit<Vector>) -> (Unit<Vector>, f32) {
 
     // The probability to have picked the ray is inversely proportional to cosine of the angle with
     // the normal
-    (scattered, 1. / scattered.dot(&normal))
+    (scattered, (1. / scattered.dot(&normal)).min(f32::MAX))
 }
 
 pub fn buffer_to_image(buffer: &[LinearColor], passes: u32, width: u32, height: u32) -> RgbImage {