Subject:
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Re: SR 3D Builder Version 0.2.2.9 Available
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 15 Jan 2008 23:00:48 GMT
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Viewed:
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4119 times
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In lugnet.cad, Sergio Reano wrote:
> Hi
>
> as someone told, I'm using Microsoft DirectX 9 program interface in my program.
>
> I cannot use OpenGL becouse my known of C++ are not good and, belive it or not,
> I'm using VisualBasic.NET for developing.
>
> The problem is that I've to write a custom shader to light backface, thing that
> is natural in OpenGL, and to do that I used some low level call to vertex shader
> that are supported only from version 2.0 to go.
There's actually a very simple workaround for this, that could be enabled on
hardware that doesn't support SM2. Make sure back faces are culled (not drawn),
and draw all polygons twice: once the normal way, and a second time with the
vertices specified in the reverse order. This doubles the number of polygons
being drawn, but due to hardware caches won't normally produce the 2x slowdown
that you would expect.
--Travis
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Message is in Reply To:
 | | Re: SR 3D Builder Version 0.2.2.9 Available
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| Hi as someone told, I'm using Microsoft DirectX 9 program interface in my program. I cannot use OpenGL becouse my known of C++ are not good and, belive it or not, I'm using VisualBasic.NET for developing. The problem is that I've to write a custom (...) (17 years ago, 14-Jan-08, to lugnet.cad)
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