Eric,
You should look at your TexEnv parameters. Use something like DECAL or
REPLACE. Looks like you are using the default, which is MODULATE, which takes
into account the color of the polygon with the texture. Of course these modes
(DECAL,REPLACE) will disable any lighting that is going on, but you seem to
want that anyway.
HTH
--
Chuck
On Feb 16, 2011, at 12:42 PM, Eric Sokolowsky wrote:
Jason,
Thanks for the suggestion. I did re-render the image at twice the size but
I'm still seeing that the textured polygon version is noticeably dimmer than
the DrawPixels version. See the attached image. I have three images here,
each rendered twice, the top drawn with the textured polygon and the bottom
rendered with DrawPixels. I'm not doing any enlargement now. Any ideas on why
the DrawPixels version so much brighter than the textured polygon?
-Eric
On Wed, Feb 16, 2011 at 11:35 AM, Jason Daly jd...@ist.ucf.edu wrote:
On 02/16/2011 10:44 AM, Eric Sokolowsky wrote:
Hello,
Does anyone have suggestions on getting the textured version brighter,
hopefully as bright as the DrawPixels version?
The textured version is probably getting dimmer because of the linear
magnification filter. Since your background is black, any pixels in the
image that are partially covering a pixel on the screen are getting mixed
with the black background and the overall luminance is lessened because of
that. The DrawPixels version is obviously blocky because you're drawing
without any kind of magnification filter. If you switched the mag filter
settings on the texture version to GL_NEAREST instead of GL_LINEAR, I imagine
your results will look very much like the DrawPixels version.
Of course, the real problems is that you're rendering the given image to a
resolution that is significantly larger than its actual size. Ideally, you'd
want to enlarge the original image to as close to the target resolution as
you can before using the texturing operations to draw it to the screen. I
don't know the source of the image, so I don't know if it's possible or
practical to do this, but that would be the best solution.
--J
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