[PD] Gem: Change blending mode ?

Alexandre Quessy listes at sourcelibre.com
Thu May 11 05:07:12 CEST 2006

Hem, which red book ? sorrry.

So, if I understand well : "Transparency is best implemented using
blend function (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) with primitives
sorted from farthest to nearest."  ?

Taken from http://www.mevis.de/opengl/glBlendFunc.html


Thanks, tigital and Chris.

By the way, James, should I always replace the Gem that is bundled
with Hans installer for your Gem version (from your Mac.com site) ?


On 5/8/06, chris clepper <cgc at humboldtblvd.com> wrote:
> glBlendFunc()  There is a whole section on it in the RedBook.
>  Fragment shaders are also useful for this.
> On 5/8/06, Alexandre Quessy <listes at sourcelibre.com> wrote:
> >
>  Hi list,
> I am much playing around with alpha blending in Gem these days and I
> was wondering how I could change the default blending mode between
> geos. I think it is feasable with openGL objects, but there are only
> two openGL examples in the example/help patches.
> The default blending mode between geos is "add". I would like to set
> it to "multiply" in some cases and "mask", so that when we are viewing
> a geo with a pix texture on it, we don't see the other geos' pix
> textures behind it ? I am sure this is possible. How ?
> regards,
> aalex
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