[MINC-users] How to create a "wireframe" surface object?

[Alexandre CARMEL-VEILLEUX]

On Tue, Jun 26, 2007 at 09:49:01AM -0400, Najmeh Khalili M. wrote:
> 
> I couldn't get the tags_to_spheres produce pretty markers, but
> reducing the surface opacity allowed me to ray_trace subcortical
> objects.
> 
> The plygons_to_lines works well. (Is there a way to subsample
> the polygons? I tried "smooth_lines" on the polygon.obj,
> but it doesn't seem to change anything. I tried it with
> distance 0.2 and 100!!)

Couple of things about ray_trace:

	* It can't render well meshes that contain anything but
	  triangles. There's a command to convert polygons to
	  triangles to do that. (Something like triangulate_polygons
	  from memory but I'd have to check.)
	
	* -one_hit tends to produce nicer looks with semi-opaque
	  surfaces. The effect may or may not be desirable to you.

	* ray_trace has tons of undocumented switches such as
	  -marker_sphere, -marker_size, -marker_colour and so on.

	* Dave MacDonald's tutorial is fairly good (but incomplete):
	  http://www.bic.mni.mcgill.ca/~david/Ray_trace/ray_trace_tutorial.html

Alex

> 
> Cheers
> Naj
> 
> On Tue, 26 Jun 2007, [ISO-8859-1] Lasse Riis Østergaard wrote:
> 
> > I don't think ray_trace allows wireframe rendering. Instead you can do
> > the following:
> >
> > Step 1 - polygons_to_lines polygon.obj poly_lines.obj
> > Step 2 - ray_trace -output image.rgb poly_lines.obj -bg white -size 350
> > 350 -top -crop
> >
> > Lasse
> >
> > Najmeh Khalili M. wrote:
> > > Hi, I need to generate a surface object in order to use it with
> > > ray_trace. As I am interested in showing subcortical markers, I
> > > need the object file to be semi-transparent, preferably with
> > > wireframe representation.
> > >
> > > I'd appreciate any suggestions.
> > > Naj
> > >
> > > _______________________________________________
> > > MINC-users at bic.mni.mcgill.ca
> > > http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
> > >
> >
> > _______________________________________________
> > MINC-users at bic.mni.mcgill.ca
> > http://www.bic.mni.mcgill.ca/mailman/listinfo/minc-users
> >
> 
> 
> 

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