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Re: [IV3D-USERS] Modifying 2D Transfer function in ImageVis3D


Chronological Thread 
  • From: Aashay Mittal < >
  • To: "tom (mobile)" < >
  • Cc:
  • Subject: Re: [IV3D-USERS] Modifying 2D Transfer function in ImageVis3D
  • Date: Sun, 26 Jun 2016 02:00:04 +0530
hi,
thanks for the reply.
I saw the other similar discussion as well and hence, looked into the "GLGridLeaper-Method-2D-L.glsl" and other "GLGridLeaper*" files. All of these contain a function, ComputeColorFromVolume( ) that returns a vec4 containing the RGBA values, to "GLGridLeaper-blend.glsl".
However, i tried to tweak the same by supplying a vec4(0,0,0,0) to all and check if this function is actually being called, but no visible changes appear.
Also, commands like printf( ),cout do not seem to work, indicating these files are not being accessed.

Regards
Aashay Mittal
2014001
Non-Tech Events OC | Esya'16

On Sun, Jun 26, 2016 at 1:03 AM, tom (mobile) < > wrote:
Hi, welcome.

Timely.  Someone else asked about the exact same thing ~a month ago.  Check the archives for details, but basically: this happens in glsl shaders, I would recommend the GLGridLeaper* ones since that renderer is the best one.  But, as far as I'm aware that still requires you have a newish NVIDIA card and Linux/Windows, still.

HTH,

-tom

On June 25, 2016 10:50:01 AM PDT, Aashay Mittal < > wrote:
>Hi
>I am a student at IIIT Delhi (India), and am working on a project on
>transfer
>functions.
>ImageVis3D seems to be the best software that is open-source and
>supports the
>gradient based 2D transfer function.
>I however, want to modify the transfer function applied to apply
>transfer
>function based on their 3D spatial location.
>(i.e. i want to assign a voxel denoted by P(x,y,z) an RGBA mapping
>instead of
>a point indicated by (I,f'(I) ).
>I've been looking into the software from quite a few days, but since am
>a
>student and new to graphics and rendering, haven't been able to have
>much
>success in the same.
>So if you could please point out the files where this mapping between
>points
>and color assigned to them is taking place.
>
>Regards



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