Custom Cameras (FishEye, Panorama, Etc)

Helper

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On 15/10/2005 at 08:00, xxxxxxxx wrote:

This can be done by creating a small sphere around the camera that contains a volume shader that bends the rays accordingly in a MaterialData plugin. You can test this by modifying ParticleVolume.cpp to not set SHADER_VOLUMETRIC and then do something like:

    
    
    void ParticleVolume::CalcSurface(PluginMaterial *mat, VolumeData *vd)  
    {   
      if (vd->tray)  
      {  
        // Disperse rays in camera X direction  
        vd->tray->v -= LV(0.2 * vd->GetRayCamera()->m.v1 * (SV(vd->tray->v) * vd->GetRayCamera()->m.v1));  
      }  
      vd->trans = 1.0;  
    }

Put it on a small sphere surrounding the camera. Then you can play with different ways to modify the ray.

Helper

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On 01/11/2005 at 12:29, xxxxxxxx wrote:

After strolling through the R9.5 documentation, I'm wondering if this shouldn't be possible by using "Custom lenses with VIDEOPOST_CUSTOMLENS"?

Kabe

Helper

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On 01/11/2005 at 12:36, xxxxxxxx wrote:

Yes. Though please note that this feature requires the next update of C4D, which will be released soon. (As does everything below "Browser library" in the list of changes.)

Helper

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On 18/12/2005 at 13:52, xxxxxxxx wrote:

Well, as that version is released now, would you mind giving a hint how to do this with VIDEOPOST_CUSTOMLENS?

Thanks!

Kabe

Helper

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On 02/01/2006 at 14:33, xxxxxxxx wrote:

You give the VIDEOPOST_CUSTOMLENS flag for your videopost node in GetRenderInfo(). Then C4D will send MSG_VIDEOPOST_CREATERAY messages to you. Simply cast the data parameter to VideoPostCreateRay and set p/v depending on x/y.
If this doesn't work, please tell me what fails so that I can investigate further.

Helper

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On 22/03/2006 at 09:48, xxxxxxxx wrote:

Hi!
I tested VIDEOPOST_CUSTOMLENS flag by making a camera similar to cinema4d perspective camera and there are some diferences in rendered images. Looks like the antialiasing is somehow lost during the CREATE_RAY process...
The test was really simple, only received x/y converted to perspective and the set p/v.
Marco Silva

Helper

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On 29/03/2006 at 07:57, xxxxxxxx wrote:

Hi again!
this is my code for message function:

    
    
    
    
    Bool Message(GeListNode* node, LONG type, void *data) {
    
    
    
    
    switch (type) {
    
    
    
    
    case MSG_VIDEOPOST_CREATERAY: {
    
    
    
    
    VideopostCreateRay *vpcr = (VideopostCreateRay * ) data;
    
    
    
    
    LReal x = (vpcr->x - width/2.0) / xFactor;
    
    
    
    
    LReal y = (vpcr->y - height/2.0) / yFactor; 
    
    
    
    
    LReal alt, azi, z;
    
    
    
    
    // gnomonic projection, it's a spherical projection equivalent to perspective
    
    
    
    
    gnomonicProjection(-x, y, alt, azi);
    
    
    
    
    // convert altitude and azimuth to vector form
    
    
    
    
    LReal cos_alt = cos(alt);
    
    
    
    
    y = cos(azi) * cos_alt;
    
    
    
    
    x = sin(azi) * cos_alt;
    
    
    
    
    z = sin(alt);
    
    
    
    
    // camera position
    
    
    
    
    vpcr->p.x = camera_x;
    
    
    
    
    vpcr->p.y = camera_y;
    
    
    
    
    vpcr->p.z = camera_z;
    
    
    
    
    // precalculated values for vector rotation
    
    
    
    
    vpcr->v.x = x*v11 + y*v12 + z*v13;
    
    
    
    
    vpcr->v.y = x*v21 + y*v22 + z*v23;
    
    
    
    
    vpcr->v.z = x*v31 + y*v32 + z*v33;
    
    
    
    
    return TRUE;
    
    
    
    
    }
    
    
    
    
    }
    
    
    
    
    return TRUE;
    
    
    
    
    }

this code works perfectly if antialiasing is set to best (16x16), otherwise object edges become aliased...
can someone please help me... I don't understand why this is happening...

Marco Silva

Helper

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On 31/03/2006 at 10:34, xxxxxxxx wrote:

Does everything else than Best 16x16 equal None in the AA settings or are the edges just less AA'd the less AA you have set in there? Could you post a complete ray creation algorithm (not necessarily your real one) that shows the problem? I always got somewhat decent AA when I tried.

Helper

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On 31/03/2006 at 10:37, xxxxxxxx wrote:

According to the developers VIDEOPOST_CUSTOMLENS will always force the Best AA setting (same as with QTVR, since no projection of geometry edges is possible). Could that be what you're seeing?

Helper

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On 03/04/2006 at 11:41, xxxxxxxx wrote:

Probably...
The AA Best 16x16 or no AA both make a perfect render. But using other options all the edges suffers from aliasing...
It isn't very perceptible but he problem is there...
I don't known if you already seen this problem nor if it possible to solve...
Other question, is possible to invalidate one ray in MSG_VIDEOPOST_CREATERAY?
By other other words, don't render one specific ray, or give it a color, like black.
thanks
Marco Silva

Helper

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On 12/05/2006 at 07:34, xxxxxxxx wrote:

Hi all!

I may have found a bug on CUSTOMLENS, when I set 2 planes, one in front of the other, and the nearest is transparent, the ray generated by CREATERAY doesn't hit the far plane!

I think this problem is in CUSTOMLENS code, since transparency seems not to be honored...

sdk version: 9.5

Thanks
Marco Silva

Helper

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On 16/05/2006 at 07:40, xxxxxxxx wrote:

Hi again!

Ok this problem has been solved in this new release...
In 9.6 CUSTOMLENS works fine!

Marco Silva

Helper

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On 29/08/2006 at 08:30, xxxxxxxx wrote:

Hi all,

Again one question about CUSTOMLENS, when I set this flag on my code the post effect "lens effect" simply doesn't render anything...

Is this supposed to happend?

Cheers,
Marco Silva

Helper

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On 02/09/2006 at 07:33, xxxxxxxx wrote:

Yes, it seems like some post effects will not work with a custom lens. I've passed this on to the developers. Thanks for reporting!