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I have a complex model (272883 faces) which I apply Limited Dissolve to and then faces reduces to 91796 (very nice). I export the model as a MSFS glTF but when I import the faces are 175076. I am wondering why the faces reduced to 91796 only to 'expand' again. I seem to have everything 'ticked' in the export MSFS giTF panel. BEFORE LIMITED DISSOLVE enter image description here AFTER DISSOLVE enter image description here

enter image description here

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  • $\begingroup$ Hot sure what you mean. YES MSFS. Don't know how to display face count in MSFS. I have added a screen shot (above) of the imported glTF model which I exported after Limited Dissolve when displayed 91797 faces (second image) when exported but 176076 when imported (third image). $\endgroup$ Oct 23, 2021 at 5:12
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    $\begingroup$ Notice in last image that tri count matches face count. blender.stackexchange.com/a/234601/15543 gltf format breaks faces down all faces into triangles. eg if you were to export and import the default cube, it would come back triangulated. See blender.stackexchange.com/a/167383/15543 $\endgroup$
    – batFINGER
    Oct 23, 2021 at 5:42
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    $\begingroup$ Another way to put it: if exporting to gltf look at the triangle count $\endgroup$
    – batFINGER
    Oct 23, 2021 at 5:52
  • $\begingroup$ Thanks for the explanation batFINGER. So Limited Dissolve doesn't reduce triangles? Is there a method to do this other than using decimate? I am attempting to reduce the polygons for MSFS to a minimum without too much distortion as it affects 'frames per second'. $\endgroup$ Oct 23, 2021 at 6:37

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Blender counts polygons as one face, but glTF cuts polygons into multiple triangular faces.
You can display the resulting triangles in Scene Statistics.

Example of using Limited Dissolve enter image description here

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    $\begingroup$ Thanks Jachym. I have recently been using Statistics to show number of faces but didn't know that they are divided into triangles (should have gone to specsavers as they say). $\endgroup$ Oct 23, 2021 at 10:36
  • $\begingroup$ No problem, I also didn't know glTF triangulates faces :) $\endgroup$ Oct 23, 2021 at 10:44

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