DeleD Community Edition

Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

I'm trying to unite 2 a bit complex objects but not too much and I'm getting the following result:
Before:

After:

How can I unite them propely? I have to Confused

Thanks !

Mr.Fletcher · Posted: Tue Feb 19, 2008 11:28 pm Post subject:

Absolutely make sure it's not bad geometry, i.e. the model is closed, has no inner polygons (that could come from extruding badly) etc.
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Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

Here are some more examples:
Before:

After:

Before (Trying to unite the window thing with the house):

After:

Before (Trying to unite the suncover with the bar that's holding it):

After (a few polygons disappeared):

jwatte · DeleD PRO user Joined: 26 Apr 2006 Posts: 513

I have reported several scenes where problems happen, too. Sometimes, it's an actual bug; other times, it's a T junction or some other problem in my own geometry.
The DeleD CSG tools aren't perfect (just like the 3ds Max or C4 CSG tools aren't perfect, either), but it helps to try to optimize and double- and triple-check your own geometry before blaming DeleD.
And when you blame DeleD, you have to post the actual scene file so that the guys can actually try to debug it.

Jeroen · Posted: Wed Feb 20, 2008 7:25 am Post subject:

Mr.Fletcher · Posted: Wed Feb 20, 2008 11:14 am Post subject:

Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

Jeroen · Posted: Wed Feb 20, 2008 12:12 pm Post subject:

Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

Jeroen · Posted: Wed Feb 20, 2008 9:46 pm Post subject:

Thanks - they're great for improving the CSG routines. Smile

Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

Jeroen · Posted: Thu Feb 21, 2008 8:35 pm Post subject:

I figured out the problem with this model:

The polygons in this model are quads (4 vertices) but not all of them are flat! A polygon is flat when all its vertices are in the same plane. An example of a non-flat polygon: create a rectangle in the topview and then pull one of its vertices upwards. This polygon isn't flat. Now, the CSG routines depend on flat polygons. If polygons aren't flat, the CSG results are unpredictable. This should be in the Help file - WIKI!

To work around this problem, simply triangulate the model before using CSG. Triangles are flat by nature and so CSG routines will not suffer from this particular problem if objects have been triangulated.

In this case, it's the geometry that isn't entirely correct. Other models in the example-pack you sent me have the same problem and triangulating them solved it. Perhaps the CSG tools should triangulate a model by default and then perform the CSG action. This will mean longer processing times and more polygons as a result though.

Adar · DeleD PRO user Joined: 29 Aug 2007 Posts: 233

Mr.Fletcher · Posted: Fri Feb 22, 2008 12:01 am Post subject: