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Author
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Topic: Question for MH, Bryan, or Mighty
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JT
Pilot
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posted 11-28- 12:29 AM
   
In SDOE, if you have one-sided polygons on screen but with their normals facing away from the point of view (thus making them invisible), are they still being drawn? Does the game still keep track of the verts? I'm assuming they don't get drawn, but I just want to make sure.IP: Logged |
Michael Harrison
General
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posted 11-28- 12:54 AM
No, if a poly's normal is facing away from you, and the poly is one-sided, it will not be clipped or drawn (it will completely ignored as far as rendering is concerned).------------------
Director of Development
Inertia, LLC
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Bryan Russell
Pilot
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posted 11-28- 06:44 AM
Are you saying they don't get transformed if its determined the normal is facing away?Does the engine use the normal defined for a poly exclusively for back face removal, regardless of the winding direction of the polygon verts? When I was writing out the terrain it seemed to be dependant on the vertices winding, regardless of which way the normal was set. Also I recently noticed that I forgot to import any face normal info on a LOD import in OPS (they are written out as all 0.0's), but every thing seems to work fine. Do you optimise the polygon vertices when their loaded? If not I could imagine that it would be possible to skip the transformation step for a polygon's vertices based on the normals direction. Therefore it would be quite an important performance issue to get the normal right even if the backface removal is working fine. I will be fixing this little undocumented feature in OPS anyway but it is an interesting thing.
Bryan
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Sp@nky
Pilot
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posted 11-28- 09:47 AM
while playing with my p40 in ac3d i did the model with 2 sided everything cause when i went to one sided they were only visible from the inside when i did a reverse normals it looked all messed anyone know why?
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Sv
Pilot
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posted 11-28- 10:33 AM
In AC3D in 3D view select "show normals" from the 3d menu. Make sure all of the normals go the correct direction. You may need to select individual surfaces and choose "flip normals". Choose individual surfaces by selecting all of that surface's vertecies. - not fun  Usualy all you have to do is flip all of the normals for that entire object, but now always - be careful!  IP: Logged |
Sp@nky
Pilot
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posted 11-28- 04:26 PM
cool sv thanks alotIP: Logged |
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