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  How to get a Sphere's constituent triangles?  (Read 1959 times)
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Offline chumDS

Senior Newbie

« Posted 2007-06-06 09:09:12 »

Is there a way to get a list of the triangles that make up a Sphere?  (Yes, I realize that I have to not-share geometry, if I don't want the triangles for EVERY sphere Smiley)

I'm actually trying to decompose a sphere that's in my scene, and do effects with the triangles that made it up.  Think like an explosion -- so I want to remove the "Sphere" object, and replace it with the however-many-triangles objects, then have them move outward from the center and rotate.

Sure, I could do this all "by hand" -- I was just curious if there was some way to get the J3D API to hand me all the bits, pre-made.


Now, with even MORE Java!
Offline keldon85

Senior Devvie

Medals: 1

« Reply #1 - Posted 2007-06-06 09:43:26 »

If all else fails it doesn't take long to generate a sphere; it's only simple geometry!

Offline NVaidya

Junior Devvie

Java games rock!

« Reply #2 - Posted 2007-06-06 19:29:14 »

Well, I guess that you could grab the Shape3D from the Sphere, and then the GeometryArray (probably a TriangleStripArray) from that Shape3D to get the triangles. IIRC, the current version of Sphere in J3D does something extra to attempt optimal discretization for a given resolution - look at the source code for Sphere in the utils. To dynamically alter the vertex positions, look at the BY_REFERENCE option in the GeometryArray API.


Gravity Sucks !
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