"raytraced" caustics.

1 files changed, 20 insertions, 0 deletions

diff --git a/resources/shaders/caustics.frag b/resources/shaders/caustics.frag
new file mode 100644
index 0000000..f746896
--- /dev/null
+++ b/resources/shaders/caustics.frag
@@ -0,0 +1,20 @@
+#version 410 core
+out vec4 fragColor;
+
+in vec3 normal_worldSpace;
+in vec3 pos;
+in vec3 newPos;
+in vec4 col;
+in float refractProb;
+
+uniform sampler2D normSamp;
+
+void main() {
+//    fragColor = vec4(vec3((pos[0] + 1) / 2, (pos[1] + 1) / 2, 0.f), 1.f);
+    float oldArea = length(dFdx(vec3(pos[0], pos[2], pos[1]))) * length(dFdy(vec3(pos[0], pos[2], pos[1])));
+    float newArea = length(dFdx(vec3(newPos[0], newPos[2], newPos[1]))) * length(dFdy(vec3(newPos[0], newPos[2], newPos[1])));
+    float areaRatio = oldArea / newArea;
+    float intensity = pow(areaRatio * .3f, 1.5f);
+    fragColor = vec4(0.98, 1, .78, intensity * refractProb);
+//    fragColor = col;
+}