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Reduce polygons in 3d objects

1. A by Arv on 12 Jan 2024, edited 8 Feb 2024 #

   I am looking to convert a few 3d models (.obj, .skp) to IfcFurntiure. I'hv got a few models which are of very high polygons, and that is making my .ifc file very large and time consuming to open

   Is there any suggested workflow to reduce the polygons and make the mesh more simpler to load?

2. A by Ace on 12 Jan 2024 # +4 votes

   This is a blender function called limited dissolve

   1.) Select the model

   2.) go into edit mode

   3.) select all (press A)

   4.) press X

   5.) In the pop up menu select 'limited dissolve'

3. M by Moult on 12 Jan 2024 # +5 votes

   The decimate modifier https://docs.blender.org/manual/en/latest/modeling/modifiers/generate/decimate.html and merge vertices by distance https://docs.blender.org/manual/en/latest/modeling/meshes/editing/mesh/merge.html are also useful tools.

4. N by Nigel on 13 Jan 2024 # +1 votes

   There is also the OG way of just remodelling. Having started 3D CAD in the 90s when hardware was limited I become and remain a LowPoly fan. Blender is great for a 3D tracing workflow where you bring in the high poly model and then add a plane 'extrude, subdiv and snap' to create a new low poly model.

5. J by JanF on 13 Jan 2024 #

   I think most universal is remeshing from scratch:

   1. Create a new mesh topologically identical to the detailed one

   2. Subdivide/remesh to the desired polycount

   3. Shrinkwrap onto the original

   Something like this:

   https://www.pluralsight.com/blog/tutorials/retopologize-nine-times-faster-shrink-wrap-modifier-blender

6. G by Gorgious on 16 Jan 2024 # +2 votes

   There are also automatic remeshing options available, eg

   • Instant meshes (FOSS) https://github.com/wjakob/instant-meshes

   • Quad Remesher (Paid, closed source) - Integrated in Blender - https://exoside.com/

7. T by theoryshaw on 8 Feb 2024, edited 8 Feb 2024 #

   might add to the conversation:

   https://app.element.io/#/room/#OSArch:matrix.org/$thhtMKzDmDrukJm3GRg8NsBpaFEiVXaObNM7N3OHcOM

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