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  Normals causing collisions?  (Read 1166 times)
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Offline DAT64X

Senior Newbie




Java games rock!


« Posted 2003-04-18 18:09:52 »

Is there anyway to turn off normals of GeometryArrays?  Right now I draw a QuadArray in the shape of a square on the xy plane, and another one on the yz plane.  When I place an object, like a cube, on either of the two shape's normals (i.e. in the "line-of-sight" of the squares), it says my cube detects a collision.  The strange thing is, if I only draw a square on one of the planes, I don't detect collisions.  Any clues as to what might be going on?

--DAT
Offline rdcarvallo

Senior Devvie


Projects: 5
Exp: 15 years


2D Java games forever!


« Reply #1 - Posted 2003-04-18 22:41:13 »

 Are the planes intersecting the object??

 Example:

   |       <--- plane
+--+--+
|  |  |
|  |  |       <--- box
|  |  |
+--+--+
   |
   |
   |


Offline DAT64X

Senior Newbie




Java games rock!


« Reply #2 - Posted 2003-04-19 02:47:15 »

Hm, well I don't think so, though I might be wrong.  For instance, if I wanted to draw a square that is flat on the xz plane, wouldn't I do something like this?

1  
2  
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QuadArray xzShadow = new QuadArray(4, QuadArray.COORDINATES);
xzShadow.setCoordinate(0, new Point3d(lp.x, 0.0, lp.z));
xzShadow.setCoordinate(1, new Point3d(up.x, 0.0,lp.z));
xzShadow.setCoordinate(2, new Point3d(up.x,0.0,up.z));
xzShadow.setCoordinate(3, new Point3d(lp.x, 0.0,up.z));      


, where lp and up are 2 opposite-cornered points?
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