assimp / assimp/assimp-net

Exploded ifc in example project

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Dominant language
C#
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Description

I am trying to learn assimp-net. I downloaded example project and changed models.

When i run "duct.dae" everything is OK.
When i run ifc with one entity ("cube.ifc) then everything is OK.
When i run ifc with many entities ("steelDuct.ifc) the model is exploded.

I attached my project with this models.
I tried to change transformation matrix using node.Transform but i failed. I think i dont understand this.

[AssimpNetSample.zip](https://github.com/assimp/assimp-net/files/4908746/AssimpNetSample.zip)
![steelDuct-explodedModel](https://user-images.githubusercontent.com/34553866/87250277-10738000-c464-11ea-9c28-99bf799f454a.png)
![steelDuct](https://user-images.githubusercontent.com/34553866/87250278-110c1680-c464-11ea-859d-a7ff80218931.png)

Contributor guide

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Research direction

Start by running the example project from AssimpNetSample.zip with duct.dae, cube.ifc, and steelDuct.ifc to reproduce the difference. Inspect how node.Transform is applied during loading or rendering, then verify that the multi-entity steelDuct.ifc model is no longer exploded while the other example models still behave correctly.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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