JohnathanStrange Posted April 13, 2008 Share Posted April 13, 2008 Anybody know the proper expression in order to keep the normals pointing in one direction while the object itself rotates? Quote Link to comment Share on other sites More sharing options...
symek Posted April 13, 2008 Share Posted April 13, 2008 (edited) Anybody know the proper expression in order to keep the normals pointing in one direction while the object itself rotates? Are the normals those from a first frame? If so, add a PointSOP, connect rotating geometry with normals to its first input, append NullSOP as a separate branch after transformed geo, and press Lock Flag while being in first frame. Then connect it to the second input of PointSOP. In Normal field of PointSOP add: $NX2, $NY2, $NZ2 respectively. Done. PointSOP simply copies normals from a second input onto the first one. The second is your geometry baked in first frame. Does it help? cheers, sy. Edited April 13, 2008 by SYmek Quote Link to comment Share on other sites More sharing options...
SpencerL Posted April 13, 2008 Share Posted April 13, 2008 You can just put your point SOP > Add Normals before your Xform SOP, therefore your network calculates the normals before it translates/rotates your geometry. Quote Link to comment Share on other sites More sharing options...
symek Posted April 13, 2008 Share Posted April 13, 2008 You can just put your point SOP > Add Normals before your Xform SOP, therefore your network calculates the normals before it translates/rotates your geometry. ...but the translation/rotation considers normal attribute also, so transforms it accordingly... is that what was the question about? Quote Link to comment Share on other sites More sharing options...
eetu Posted April 13, 2008 Share Posted April 13, 2008 One tiny refinement; manually locking something is a bit non-procedural (dirty!), a Timeshift SOP set to constant frame 1 would be cleaner eetu. Quote Link to comment Share on other sites More sharing options...
symek Posted April 13, 2008 Share Posted April 13, 2008 One tiny refinement; manually locking something is a bit non-procedural (dirty!), a Timeshift SOP set to constant frame 1 would be cleaner eetu. Gosh! You got me, eetu! Follow eetu, eetu is right Quote Link to comment Share on other sites More sharing options...
SpencerL Posted April 13, 2008 Share Posted April 13, 2008 ...but the translation/rotation considers normal attribute also, so transforms it accordingly... is that what was the question about? Ooops, I mis-read the question. Do what they say... Quote Link to comment Share on other sites More sharing options...
rdg Posted April 14, 2008 Share Posted April 14, 2008 the transformSOP got a checkbox, if it should recalculate the normals. Maybe not of great help here, but often destroyed my fondly combed normals. Quote Link to comment Share on other sites More sharing options...
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