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Simple use of Subtract function

 
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AWM Mars
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Joined: 06 Jan 2010
Posts: 1195
Location: Wilts England

PostPosted: Mon Oct 04, 2010 11:42 am    Post subject: Simple use of Subtract function Reply with quote

This is a basic use of the CSG (Constructive Solid Geometry) Subtract function.





The order of selecting the objects is important. Select the object you want to keep first, then the object you want to be subtracted, second.







Using the Subtract function more than once on a single model, can result in unpredictable results. Along with a large increase in the amount of Polygons, Vertices's and Edges. Optimising may also result in loss of Polygons, leaving holes in the final mesh.
One way round this is, to create a series of objects, and use the Subtract function on each model in turn. Once optimised, then the models can be either Merged, or United.

I hope you find this useful.
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trucker2000
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PostPosted: Mon Oct 04, 2010 9:46 pm    Post subject: Reply with quote

Nice set of tutorials. (all 3)
All are easy to follow. Thankyou. Smile
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Jeroen
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PostPosted: Tue Oct 05, 2010 8:29 am    Post subject: Reply with quote

Very nice tutorial indeed. It's actually the same scenario I used when I developed this functionality. Smile

Snapping is turned off when performing CSG functions because the resulting object often contains very detailed geometry which, in most cases, you don't want to have snapped to the grid anymore. Do note that you can re-enable snapping of the resulting object in the Object Inspector.
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AWM Mars
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PostPosted: Tue Oct 05, 2010 9:57 am    Post subject: Reply with quote

Jeroen wrote:
Very nice tutorial indeed. It's actually the same scenario I used when I developed this functionality. Smile

Snapping is turned off when performing CSG functions because the resulting object often contains very detailed geometry which, in most cases, you don't want to have snapped to the grid anymore. Do note that you can re-enable snapping of the resulting object in the Object Inspector.

Yes Smile that is shown in the last picture.

The options in the drop down selector are: Center, Vertice and None
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AWM Mars
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PostPosted: Fri Oct 08, 2010 10:10 am    Post subject: Reply with quote

I've created a PDF document of this tutorial, for easy download and local referencing.

http://www.working.yourinside.com/DeleD/Tutorials/SimpleSubtract/A%20Simple%20Subtract.pdf
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