Giters

KhronosGroup / glTF-Sample-Assets

To store all models and other assets related to glTF

Geek Repo:Geek Repo

Github PK Tool:Github PK Tool

DirectionalLight.gltf model is modeled inside out

droettger opened this issue · comments

commented

Visualizing the world space geometry or shading normals on the face-culled geometry of the DirectionalLight.gltf shows that they are pointing to the inside
(here: color = N * 0.5f + 0.5f;)
DirectionalLight_single_sided
Also visualizing the front-face condition showed that this is actually the front-face so vertex winding and normal on front-face is consistent.
Consequently, switching the three materials to double-sided shows the expected normal orientation of the outside of the spheres:
DirectionalLight_double_sided

This results in black rendering with a ray tracer because the inside of the sphere is hit and light is blocked by the face-culled geometry in front. Switching to double-sided materials produces the correct result.