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| How to combine several meshes to a "grouped" bounding box? http://www.horde3d.org/forums/viewtopic.php?f=2&t=651 |
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| Author: | wakko [ 18.02.2009, 15:43 ] |
| Post subject: | How to combine several meshes to a "grouped" bounding box? |
I have a scene that consists of several hundred adjoining pieces of procedurally generated geometry and the whole structure can be pretty stretched/long. Each piece is added to the Horde scene graph as a separate Model node. To improve performance I wanted to group some of these mesh-pieces into a surrounding bounding box to let Horde perform a visibility check with this surrounding bounding box first instead of checking each piece of geometry anyway. So I tried to add sequences of 20 adjoining mesh pieces to a Horde groupnode. But as far as I have seen this groupnode has no separate bounding box... What's the trick to "combine" several model nodes in a surrounding bounding box? |
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| Author: | swiftcoder [ 18.02.2009, 16:17 ] |
| Post subject: | Re: How to combine several meshes to a "grouped" bounding box? |
wakko wrote: What's the trick to "combine" several model nodes in a surrounding bounding box? Right now, I don't think that there is one. The new spatial culling and LOD systems are still a work in progress, but it should eventually support multibounds for this purpose.
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| Author: | marciano [ 18.02.2009, 20:14 ] |
| Post subject: | Re: How to combine several meshes to a "grouped" bounding box? |
With the new spatial graph the group node is no more a culling primitive. Instead of creating many models you could create meshes and attach them to a single model. The model has a bounding box for all its meshes. |
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| Author: | wakko [ 18.02.2009, 23:14 ] |
| Post subject: | Re: How to combine several meshes to a "grouped" bounding box? |
Quote: Instead of creating many models you could create meshes and attach them to a single model. The model has a bounding box for all its meshes. Thanks. I will give this a try. [edit] Uhm... (how) can I attach my geometry resource to a meshnode instead of a modelnode? As far as I have seen I can attach a GeometryResource only to a modelnode. |
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| Author: | marciano [ 22.02.2009, 18:32 ] |
| Post subject: | Re: How to combine several meshes to a "grouped" bounding box? |
wakko wrote: Uhm... (how) can I attach my geometry resource to a meshnode instead of a modelnode? As far as I have seen I can attach a GeometryResource only to a modelnode. Only models can have a geometry resource but meshes can use a section of that geometry resource. So you need to put the vertex and triangle data of your small objects into a single geometry resource. |
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