Dear all,
I am using DAYSIM, not radiance directly.
When the simulation begins to run, there are these two different types of
warnings:
oconv: warning - non-planar verterx for polygon "f_1719_0" (this happens for
20 or so polygons)
rtrace_dc: warning - non-planar vertex for polygon "F_1636 (Can't see the
rest of it, this happens for probably the same polygons but not in the same
order)
I used the SketchUp to Radiance su2rad plugin to export geometry from a
sketchup model and I had to start the simulation before DAYSIM refreshed
geometry display since it was taking too long to do that.
How serious are these warnings and why are they occuring?
Thanks,
RAMANA KOTI Assoc. ASHRAE LEED(R) AP
Sustainable Building Analyst
ELEMENTS division of BNIM architects
106 West 14th Street Suite 200
Kansas City Missouri 64105
d 816.783.1635 f 816.783.1501
bnim.com | elements.bnim.com
The export of polygons from Sketchup has only a limited accuracy. This results in some
cases in polygons where one of the points is outside of the plane defined by the rest
of the vertices. Radiance has a built in tolerance for these points but when that's exceeded
the warning is generated and the vertex or the whole polygon ignored in the rendering.
I'm not sure about the last part but maybe someone else knows better.
Relevance: If the polygon is ignored and it is essential for the geometry (ie a wall of a room)
then it is relevant. If it's just a tiny piece that doesn't do much for the lighting it's harmless.
To avoid this problem export with the option 'triangulate'. This creates polygons with
only 3 vertices. Much more polygons in the scene but no warnings.
Regards,
Thomas
···
On 11 Jun 2008, at 21:24, Ramana Koti wrote:
oconv: warning - non-planar verterx for polygon "f_1719_0" (this happens for 20 or so polygons)
rtrace_dc: warning - non-planar vertex for polygon "F_1636 (Can't see the rest of it, this happens for probably the same polygons but not in the same order)
I used the SketchUp to Radiance su2rad plugin to export geometry from a sketchup model and I had to start the simulation before DAYSIM refreshed geometry display since it was taking too long to do that.
How serious are these warnings and why are they occuring?
The warnings don't indicate any action, and are only given by Radiance because cracks may appear between polygons due to the determination of an "average plane" that doesn't pass exactly through every point.
-Greg
···
From: Thomas Bleicher <[email protected]>
Date: June 12, 2008 12:16:05 PM PDT
On 11 Jun 2008, at 21:24, Ramana Koti wrote:
oconv: warning - non-planar verterx for polygon "f_1719_0" (this happens for 20 or so polygons)
rtrace_dc: warning - non-planar vertex for polygon "F_1636 (Can't see the rest of it, this happens for probably the same polygons but not in the same order)
I used the SketchUp to Radiance su2rad plugin to export geometry from a sketchup model and I had to start the simulation before DAYSIM refreshed geometry display since it was taking too long to do that.
How serious are these warnings and why are they occuring?
The export of polygons from Sketchup has only a limited accuracy. This results in some
cases in polygons where one of the points is outside of the plane defined by the rest
of the vertices. Radiance has a built in tolerance for these points but when that's exceeded
the warning is generated and the vertex or the whole polygon ignored in the rendering.
I'm not sure about the last part but maybe someone else knows better.
Relevance: If the polygon is ignored and it is essential for the geometry (ie a wall of a room)
then it is relevant. If it's just a tiny piece that doesn't do much for the lighting it's harmless.
To avoid this problem export with the option 'triangulate'. This creates polygons with
only 3 vertices. Much more polygons in the scene but no warnings.
Regards,
Thomas