[Soc-2017-dev] vertex paint project - ply exporter

[Darshan kadu]

Hello, Mr. Howard,
Sorry, I was ill from yesterday afternoon. I should haven't told you before
but internet wasn't very good its monsoon season(heàvy rain) in India.

Meanwhile, yesterday I changed the ply importer to take alpha into account.
I have pushed the code. I thing the same problem comes with the fbx
importer. I will check it. I will give reply to your mail as soon as
possible.

Sorry, I should have told you yesterday itself.

Thank you.

On 19-Jul-2017 6:40 PM, "Howard Trickey" <howard.trickey at gmail.com> wrote:

> Darshan,
>
> What are you working on now?
>
> I looked a little more at the issue of alpha display after subdividing. I
> am pretty sure now that the alphas are set properly -- if you remove all
> but, say, the front (subdivided) face, the display looks OK. I tried
> changing the glBlendfunc call to:
> glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE,
> GL_ONE_MINUS_SRC_ALPHA);
> which seems more correct, but it didn't make any difference.
>
> Maybe someone reading this with more experience with OpenGL and
> alpha-blending has an idea?  I wonder if somehow we have to turn on drawing
> the elements in proper z-sorted order?
>
>
> On Tue, Jul 18, 2017 at 9:48 AM Howard Trickey <howard.trickey at gmail.com>
> wrote:
>
>> Darshan,
>>
>> I made a little python function to dump the vertex (loop) colors on the
>> console.  You may find this useful.  If you put this in, say, the
>> release/scripts/startup folder then you can use the <Space>-menu to search
>> for 'Dump Vertex Colors'.  To see which faces and vertices correspond to
>> which dumped colors, you can start blender with --debug and then enable the
>> 'indices' visualization box in the right-hand panel of view3d (when in Edit
>> mode) to see the indices of the currently selected elements.
>>
>> I think there may be a problem with the ply exporter, discovered by using
>> this. I made a simple plane quad and put different colors and alphas on
>> each, and then the ply exporter seemed to have an off-by-one error in
>> lining up colors with vertices. But I looked briefly at the code and didn't
>> see what was wrong.
>>
>> I also checked the interpolation of alpha's when subdividing and agree
>> with you that it seems to be doing approximately the right thing, so the
>> problem is somehow in the visualization code.
>>
>
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