MeshLab - Decimating a model

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    vk2emq

    Thanks James for the article - this helped me successfully to reduce my image size - however a couple of pointers for anyone else wishing to reduce the file sizes for uploading to Sketchfab and avoid the minor difficulties I encountered :-

    1. the version of Meshlab you used is Meshlab_64bitv1.3.3 - the latest version is Meshlab 2016.12 and the menu entries are slightly different, which initially stumped me - as there is no entry in Meshlab 2016.12 of

    "Filters → Remeshing, Simplification and Reconstruction → Quadric Edge Collapse Decimation (with texture)" 

    the menu entry is

    "Filters → Remeshing, Simplification and Reconstruction → Simplication : Quadric Edge Collapse Decimation (with texture)"

    which isn't a simplication if you are looking for a menu entry beginning with Q .... !

    When saving my model as an obj the file size reduced from a dae at 74+ MB to an obj at 26+ MB with the creation of an .obj.mtl config file. The mtl file references the original texture file  used by my dae model - which was a png file of 49+ MB. I converted the texture.png to texture.jpg which was only 3+ MB and edited the .mtl file to refer to texture.jpg. So a total change in data size - model + texture from 120+ MB to 30+ MB

    cheers,  Jonno - vk2emq

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    James

    Thanks for letting me know! I'll find some time to update this page with more recent screenshots and menu entries.

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    360Pros

    Thanks for posting this! Is it possible to decimate only selected portions of a 3D scene? For example, when scanning parks and outdoor spaces with drone imagery, a HUGE portion of the face count comes from trees and foliage, which usually aren't the key objects of interest. If I could just select certain objects to decimate, I imagine it would help keep the rest of the scene looking tip-top. 

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    James

    Yes, you should be able to use the Select Faces tool to select the portion of your scene you want to decimate, and then go through the decimation filter process as usual.

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    360Pros

    Thanks James for the reply! 

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    andyginetta

    Hi James, Interesting thread to read, I'm new to meshlab so just getting up to speed.

    I've been producing some stl files from Catia to import into a simulation package. Unfortunately the sim package struggles with the high aspect ratio triangles that are produced on planar and straight extruded surfaces. Can you tell me if it's possible to re-mesh the stl with a maximum triangle edge length of 10mm (currently around 100mm)?

    Thanks in advance,

    Andy

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    James

    Hi Andy,

    Meshlab has quite a lot of decimation functions in the Filters → Remeshing, Simplification and Reconstruction menu. I'm no expert, but you could try some of the others to see what works best for these types of models?

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