Gergori, > 1) what is the difference between LINES, LINE_LOOP, > LINE_STRIP. If I understood correctly, LINES is to build single lines, > > LINE_LOOP will connect the first and the last point (VERTEX), > but no clue about LINE_STRIP. > > 2) what is the difference between TRIANGLES, TRIANGLES_STRIP > and TRIANGLE_FAN
Consult OpenGL docs (GL_LINES, GL_LINE_LOOP, etc.) -- CGOs are essentially just OpenGL rendering streams. > 3) is it possible to render a plain polygon (I suppose I can > build a succession of triangles, but is there another way to do it?) Not with CGOs. The ray tracer only has triangle, cylinder, and spheres primitives, which is why CGOs are limited to just triangles, spheres, and cylinders. > 1) in the Pymol manual, I read that LINEWIDTH was for > line-width, and WIDTHSCALE was for ray-tracing; > but what I observed is that LINEWIDTH do not change the line > thickness (always 1 pixel) in the normal view but in > ray-traced images, and when I use WIDTHSCALE Pymol simply > crashes during ray-tracing Is this a bug? I use the latest > version of Pymol with WinXP Pro SP2 and my graphic card is an > ATI Radeon 9700 with the latest drivers. Not sture, but I think WIDTHSCALE is basically broken and should be deprecated. LINEWIDTH should work, but if it doesnt, then I suggest using the cgo_line_width setting to control line widths for now. Cheers, Warren -- Warren L. DeLano, Ph.D. Principal Scientist . DeLano Scientific LLC . 400 Oyster Point Blvd., Suite 213 . South San Francisco, CA 94080 USA . Biz:(650)-872-0942 Tech:(650)-872-0834 . Fax:(650)-872-0273 Cell:(650)-346-1154 . mailto:war...@delsci.com > -----Original Message----- > From: pymol-users-ad...@lists.sourceforge.net > [mailto:pymol-users-ad...@lists.sourceforge.net] On Behalf Of > Grégori Gerebtzoff > Sent: Monday, May 30, 2005 6:08 AM > To: pymol-users@lists.sourceforge.net > Subject: [PyMOL] Questions & comments about CGO objects > > Hi list ! > > I was just building (successfully) my first CGO object, and I > have three questions and two comment: > > > > Questions: > > 1) what is the difference between LINES, LINE_LOOP, > LINE_STRIP. If I understood correctly, LINES is to build single lines, > > LINE_LOOP will connect the first and the last point (VERTEX), > but no clue about LINE_STRIP. > > 2) what is the difference between TRIANGLES, TRIANGLES_STRIP > and TRIANGLE_FAN > > 3) is it possible to render a plain polygon (I suppose I can > build a succession of triangles, but is there another way to do it?) > > > > Comments: > > 1) in the Pymol manual, I read that LINEWIDTH was for > line-width, and WIDTHSCALE was for ray-tracing; > > but what I observed is that LINEWIDTH do not change the line > thickness (always 1 pixel) in the normal view but in > ray-traced images, and when I use WIDTHSCALE Pymol simply > crashes during ray-tracing Is this a bug? I use the latest > version of Pymol with WinXP Pro SP2 and my graphic card is an > ATI Radeon 9700 with the latest drivers. > > 2) when you use the COLOR command in a CGO object, this color > cannot be overridden with the color menu in Pymol, so simply > > dont use the COLOR command if you want to be able to change > the color of your object within Pymol! > > > > Many thanks for your answer(s)! > > > > > > Grégori Gerebtzoff > > > > Division of Biophysical Chemistry > > Biozentrum, University of Basel > > Klingelbergstrasse 70 > > CH-4056 Basel / Switzerland > > > > Tel: +41 61 267 21 92 > > Fax: +41 61 267 21 89 > > e-mail: gregori.gerebtz...@unibas.ch > >
