FBX vs glTF Colors
FBX vs glTF Colors
The difference in how FBX and glTF models appear when there's no light source in the scene is due to how each format handles lighting and material properties.
FBX Models:
- Lighting Dependency: FBX models typically rely on external lighting to display their colors and textures properly. If there's no light in the scene, the model will appear black because the lighting system can't illuminate the surfaces to show the colors.
- Material and Shader Settings: FBX files often use more traditional rendering methods where the color and texture visibility heavily depend on the light sources present in the scene.
glTF Models:
- PBR (Physically-Based Rendering): glTF models usually come with PBR materials, which are designed to simulate how light interacts with surfaces in a more realistic way. However, glTF also supports a fallback mechanism where materials can show their base color even when there's no light source, often referred to as "unlit" or "base color only" rendering.
- Default Environment: Many glTF viewers or engines provide a default ambient light or environment lighting, which ensures that the model's colors are visible even without explicit lights in the scene.
Summary:
FBX models generally require proper lighting to display colors, whereas glTF models can show their base colors even in the absence of lighting due to their support for unlit materials or ambient light. This difference in rendering behavior makes glTF more adaptable in scenarios with varying or no lighting conditions.
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