X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;ds=sidebyside;f=gl%2Fmesh_surfaceangle.frag;fp=gl%2Fmesh_surfaceangle.frag;h=3ee94ddff05f8ff83c86b90b443b44b17c48bf9d;hb=dd4a156f8787b310568d82161bddd478b0938499;hp=0000000000000000000000000000000000000000;hpb=0da9fdf2b9623665a991990e57485a007645eba6;p=fstl

diff --git a/gl/mesh_surfaceangle.frag b/gl/mesh_surfaceangle.frag
new file mode 100644
index 0000000..3ee94dd
--- /dev/null
+++ b/gl/mesh_surfaceangle.frag
@@ -0,0 +1,17 @@
+#version 120
+
+uniform float zoom;
+
+varying vec3 ec_pos;
+
+void main() {
+    vec3 ec_normal = normalize(cross(dFdx(ec_pos), dFdy(ec_pos)));
+    ec_normal.z *= zoom;
+    ec_normal = normalize(ec_normal);
+    //rotated 10deg around the red axis for better color match
+    float x = dot(ec_normal, vec3(1.0, 0.0, 0.0));
+    float y = dot(ec_normal, vec3(0.0, 0.985, 0.174));
+    float z = dot(ec_normal, vec3(0.0, -0.174, 0.985));
+
+    gl_FragColor = vec4(0.5-0.5*x, 0.5-0.5*y, 0.5+0.5*z, 1.0);
+}