Author Topic: [GLScene] Crash when setting camera UP direction  (Read 4066 times)


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[GLScene] Crash when setting camera UP direction
« on: July 08, 2009, 09:49:50 am »
I'm creating a 3D viewer in Lazarus using GL-scene.

If I want to view my object from the Y-axis with the Z-axis pointing upwards I use the following code (simplefied)

Code: [Select]

  GLCamera1.Position.Y := GLCamera1.TargetObject.Position.Y - 10;
  GLCamera1.Position.X := GLCamera1.TargetObject.Position.X; //solves the problem + 0.001;
  GLCamera1.Position.Z := GLCamera1.TargetObject.Position.Z;

  GLCamera1.Up.Z := 1;
  GLCamera1.Up.X := 0;
  GLCamera1.Up.Y := 0;


This however results in a "Projet raised exception class 'External: ?'. error on some computers.

My scene contains a camera (GLCamera1, a glcube used as target object and a EarthSkyDome). If I make the EarthSkyDome invisible then everything works ok.

Is this an error (in which case I'll submit it as a bug)? Or am I just doing something stupid?
I have the source code attached. Running lazarus with GLScene


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Re: [GLScene] Crash when setting camera UP direction
« Reply #1 on: July 24, 2009, 02:09:10 pm »
I've tested this on multiple systems now. Problem only seems to occur on machines with intel (ob) graphics so far.

On machines with:
- NVidia quadro fx 3500 or
- ATI mobility 600
the code below works fine...


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