antialiasing off with draw3DLine

overdrivr · Post by **overdrivr** » Wed Feb 02, 2011 1:41 pm

I noticed when you draw 3DLines and a mesh, the antialiasing on the mesh's texture is turned off, and when you stop drawing 3D lines, the antialiasing is turned on. Maybe it's not a bug, just a feature :p

I can post some screenshots if needed.

Irrlicht 1.7.2
Windows 7 pro
renderer OpenGl 2.1.2
GEForce GO 7300/PCI/SSE2

I used the search but didn't find this already.

hybrid · Post by **hybrid** » Wed Feb 02, 2011 4:44 pm

Yes, screenshots and code are needed. Could also be that it's a limitation of your graphics card. But I need to test this.

overdrivr · Post by **overdrivr** » Wed Feb 02, 2011 5:20 pm

Ok here the screenshots :

Grid : antialiasing off

No Grid : antialiasing on :

And the archive with everything :

http://vtsteam.free.fr/069pjh4mte/archivebug.rar

hybrid · Post by **hybrid** » Wed Feb 02, 2011 5:49 pm

I think this has been fixed already in SVN. It's actually just the filter setting which is wrong here, nothing to do with anti-aliasing. But I'll check it with latest versions.

agamemnus · Post by **agamemnus** » Thu Feb 03, 2011 7:36 pm

The filter setting difference is much more obvious.
He does have seem to have anti-aliasing in the second picture, but I'm not sure. I checked in MSPaint and the edges are slightly smooth; that might just be the texture filter, though.

overdrivr · Post by **overdrivr** » Fri Feb 04, 2011 9:00 pm

I'm not an expert but anti-aliasing is a method for texture filtering, no ?

bitplane · Post by **bitplane** » Fri Feb 04, 2011 9:13 pm

No, anti-aliasing is full-screen and is about rendering X times more sub-pixels for each real pixel, then using their average for the pixel value.

So with anti-aliasing there would be no jaggies on the edges of the box in the second picture.

Mel · Post by **Mel** » Fri Feb 04, 2011 11:49 pm

The antialiasing avoids the jaggies of the lines, it oversamples the borders of the polygons (i asume...) and generates smooth lines. And bi/tri-linear filtering improves the looks of the textures by interpolating some texture pixels on the textures.

The case is that when the antialiasing is enabled and there are drawn lines, the bilinear filtering seems to disable. But as hybrid says, it is already fixed.

overdrivr · Post by **overdrivr** » Sat Feb 05, 2011 10:38 am

Ok i didn't know about this technic, thanks guys. So if the bug has been corrected, problem solved.