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Ursprungligen postat av giovanni71

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Okay, I will try to explain with an example from your latest pictures.
Look at the front around the windows, especially the wall section above and below the windows that I painted yellow.
The points along the straight edge above and below the yellow fields can be welded to the point next to it reducing the model by one polygon for each weld.
Sorry for the bad drawing quality in the second picture but I hope you get the idea.
Not much per weld but there are lots of this in that model and the total can be quite substantial.

Since it is a flat area the welding of points will not change the overall shape but reduce points and polygons.
Welding of points can be continued everywhere you have several points in a straight line and the polygons have parallel normals (face the same direction).

There are some commands in 3D Canvas that can help with this.
You have the welding tools operating on points and you have the Optimize Object Geometry operation which you should try first.
Texturing should be done after optimisation or you might have to redo the texturing.

/Anders