Inverted Normals

Symptoms: Your model appears partially transparent or inside-out in Sceneri. This happens when the surface normals (the direction each face points) are inverted.

1. Identify Inverted Normals in Blender:
   • In Edit Mode, select your model and go to Overlays (the grid icon in the top right of the 3D Viewport).
   • Enable Face Orientation. Red faces indicate inverted normals, while blue faces are correctly oriented.
2. Correct the Normals:
   • Select all faces in Edit Mode by pressing A.
   • Go to Mesh > Normals > Recalculate Outside. This should reorient all normals to face outward.
3. Check for Double-Sided Faces (if needed):
   • Sometimes, complex geometry may have hidden faces that are flipped. In Edit Mode, select any problematic faces, right-click, and choose Flip Normals to adjust them manually.
4. Export and Test:
   • Once corrected, export the model and re-import it into Sceneri to verify that the issue is resolved.

Scaling Issues

Symptoms: The model appears too small or too large in Sceneri, often because Blender and Sceneri use different default units and scaling conventions.

1. Check Scale in Blender:
   • In Object Mode, select your model and go to the Item tab in the Properties panel. Ensure that Scale is set to (1, 1, 1) for all axes.
2. Apply Scale:
   • Press Ctrl + A and select Scale to apply the current scale to the model.
   • This resets the scale values to 1, ensuring that the object will export with the correct dimensions.
3. Set Units:
   • Go to Scene Properties (the cone icon) > Units. Set Unit Scale to match the scale used in Sceneri, typically Metric with a unit scale of 1.0.
   • Re-export the model and check in Sceneri to see if it now appears at the correct size.
4. Adjust Scale on Export:
   • When exporting, especially in FBX format, look for a Scale setting and set it to 1.0. This will ensure that the model’s size matches what you see in Blender.

Missing Textures

Symptoms: Textures applied in Blender are not showing up in Sceneri, which can be due to incorrect file paths or unsupported texture formats.

1. Use Relative Paths:
   • In Blender, go to File > External Data and select Make Paths Relative. This ensures that Blender will look for textures in the same folder or relative path during export.
2. Pack Textures into the File:
   • To avoid missing textures, go to File > External Data > Pack Resources. This will embed the textures directly into the exported file.
3. Check Texture Formats:
   • Sceneri supports standard image formats such as PNG and JPEG. Make sure your textures are in one of these formats. If not, convert them before importing.
4. Verify Material Setup in Blender:
   • In Shader Editor, ensure that each material has a Base Color linked to the appropriate image texture node. Any textures not connected to the material may not be recognized on export.
5. Re-Export and Import:
   • Export the model again, ensuring that the Include option for Materials or Textures is selected. When re-importing into Sceneri, verify that the textures load as expected.

Stretched UVs

Symptoms: Textures appear stretched or distorted on the model in Sceneri, often due to incorrect UV mapping in Blender.

1. Check the UV Map in Blender:
   • In Edit Mode, go to the UV Editor and check the UV layout of the model.
   • Select all faces by pressing A. Look for stretched or distorted UV islands, which may indicate areas that need to be adjusted.
2. Unwrap Again (if needed):
   • Press U and choose Unwrap to redo the UV mapping.
   • If your model has complex shapes, try other options like Smart UV Project or Lightmap Pack to improve UV coverage.
3. Use Correct UV Scaling:
   • If certain areas of the texture appear stretched, select those faces in the UV Editor and scale them down proportionally to fit the texture properly.
4. Apply UV Smoothing (Optional):
   • For smoother UV transitions, consider applying UV smoothing when unwrapping, especially if working with organic shapes. This can reduce visible seams and distortions.
5. Export and Test in Sceneri:
   • After finalizing the UV map, re-export the model and check in Sceneri to see if the texture displays without any stretching.

Conclusion

When importing Blender models into Sceneri, it’s essential to prepare the geometry properly to avoid issues like inverted normals, scaling discrepancies, missing textures, and stretched UVs. By following these troubleshooting steps, you can ensure your models look and perform their best in Sceneri.