If a 3D sprite model (e.g., billboarding) is broken, key causes are incorrect shader settings, geometry errors, or engine compatibility issues.
Shaders control how the model faces the camera—misconfigurations lead to rendering glitches like distortion. Geometry problems (missing faces, flipped normals) make parts invisible or look wrong. Engine mismatches (outdated tools/formats) also break display.
First, check the shader’s billboarding options. For geometry issues, use Blender to fix faces/normals—these quick steps often resolve common problems.