DrawPoint2D() Clipped in OpenGL

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On 03/06/2011 at 02:54, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   12 
Platform:    Mac  ;  
Language(s) :     C++  ;

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I'm calling DrawPoint2D() from SceneHook::Draw().

The position passed to DrawPoint2D() is calculated in camera space and converted to screen space.

When the drawn point is 50 mm or less from a Perspective camera, it disappears. The threshold is exactly 50 mm, e.g. it is visbile at 50.01 mm.

This only happens in OpenGL mode.
Enhanced OpenGL makes no difference.
No other viewport settings make any difference.
It doesn't happen with a Parallel camera.

I'm on an iMac 29.3 GHz i7 with an ATI Radeon HD 5750.

What can the problem be?

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 03/06/2011 at 06:41, xxxxxxxx wrote:

The vector returned by bd->CS() has a negative Z value. I've solved the problem by setting Z to 0 before passing the vector to DrawPoint2D().

I'm not sure why it was happening specifically as described but at least it's fixed.

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On 06/06/2011 at 06:33, xxxxxxxx wrote:

Please check if changing the view clipping in the project settings makes a difference.

cheers,
Matthias

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On 07/06/2011 at 03:09, xxxxxxxx wrote:

Thanks Matthias, I wasn't aware of this setting and need to take it into account for my plugin.

When passing the unmodified vector to DrawPoint2D(), the point is always clipped 50 mm from the camera. If its Z value is set to 0, the unwanted clipping never occurs. The View Clipping setting has no effect in either case.

There appears to be an error in the SDK for BaseDocument::GetSettingsInstance(). I get the near clipping value like this:

  
BaseContainer* bc = doc->GetSettingsInstance(DOCUMENTSETTINGS_DOCUMENT);   
if(!bc) return TRUE;   
Real nearClip = bc->GetReal(DOCUMENT_CLIPPING_PRESET_NEAR);   

According to the SDK, DOCUMENTSETTINGS_DOCUMENT is private and I should be using DOCUMENTSETTINGS_GENERAL instead. If I use the latter, an invalid pointer is returned.

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On 07/06/2011 at 03:59, xxxxxxxx wrote:

Yes, thanks, the SDK has to be updated about document settings.

cheers,
Matthias

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On 07/06/2011 at 08:13, xxxxxxxx wrote:

How do you change these attributes?

I've tried the obvious:

  BaseContainer *bc = doc->GetSettingsInstance(DOCUMENTSETTINGS_DOCUMENT);  
  if(!bc) return TRUE;  
  
  Real nearClip = bc->GetReal(DOCUMENT_CLIPPING_PRESET_NEAR);  
  GePrint(RealToString(nearClip)); // Prints a value of 1  
  
  bc->SetData(DOCUMENT_CLIPPING_PRESET_NEAR, .01);//<--- Does not work  
  bc->SetReal(DOCUMENT_CLIPPING_PRESET_NEAR, .01);//<--- Does not work  
  bc->SetData(nearClip, .01);//<--- Does not work  
  bc->SetReal(nearClip, .01);//<--- Does not work  
  GePrint(RealToString(nearClip)); // still returns a value of 1  
  
  EventAdd();

-ScottA

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On 07/06/2011 at 09:10, xxxxxxxx wrote:

I have not tested yet, please give GetData/SetData a try.

cheers,
Matthias

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On 07/06/2011 at 09:57, xxxxxxxx wrote:

?
I am using SetData.

The closest thing to this that I've used is something like this:

BaseContainer *w = GetWorldContainerInstance();  
w->SetData(WPREF_MAX_UNDOS, 40); // Sets the number of undo's to 40

And for the other kinds of BaseDocument containers(render settings, views settings, etc). This is the typical method to change  those attributes:

BaseDraw* bd = doc->GetActiveBaseDraw();    
bd->SetParameter(BASEDRAW_DATA_SDISPLAYACTIVE, 0, DESCFLAGS_SET_0); // Shading mode  

These new R12 Document attributes seem to work a bit different from the other ones.
If you get the time. Can you please look into how to change these?
I'm in no big hurry for this information. So if you're too busy I can wait.
It's just something that would be nice to know how to do at some point.

Thanks,
-ScottA

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On 07/06/2011 at 17:01, xxxxxxxx wrote:

You can use SetParameter like this:

doc->SetParameter(DOCUMENT_CLIPPING_PRESET_NEAR, GeData(0.01), DESCFLAGS_SET_0);

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On 07/06/2011 at 17:50, xxxxxxxx wrote:

Thanks David.

Got it working now.🍺

-ScottA