microsoft / microsoft/TRELLIS

Dark textures or shades on backside of object

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Dominant language
Python
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Description

Hi Trellis team,

I've noticed that when I generate a model, the front side displays well-colored textures, but the backside remains almost completely dark, even when viewed in Blender. Adding multiple images from different angles slightly improves the result, but the textures and lighting on the rear still seem inconsistent.

It appears the model has difficulty predicting or rendering backside textures and lighting accurately.
Could you please look into this or suggest a workaround?

Thanks for your support!

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the generated model in Blender and compare backside textures and lighting when using one image versus multiple viewing angles. The issue does not mention a source file or test; done would require identifying whether the dark backside is a reproducible defect and documenting a confirmed fix or workaround.

Written by the indexing model from the issue text.

Assessment

Tech stack
blender, python
Domain
computer-graphics, machine-learning
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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