Camera rotation?

[mystic jimbo]

Greetings,

Am I doing something wrong or is it so that you can't rotate a camera with setRotation? Or should I do something extra after I call setRotation?

[Xaron]

You are right. You can't rotate the camera using setRotation. A camera has a target (the direction it looks to) and an up vector. You need to set these two vectors to rotate a camera.

Here some code:

Code: Select all

void Camera::update( core::vector3df& offset, const core::vector3df& position, const core::vector3df& rotation )
{
  assert( _camera );
  if( !_camera )
    return;

  core::matrix4 rotMatrix;
  rotMatrix.setRotationDegrees( rotation );

  // Set up vector for the camera
  core::vector3df camUpVector = core::vector3df( 0.0f, 1.0f, 0.0f );
  rotMatrix.transformVect( camUpVector );

  // Set target vector for the camera
  core::vector3df targetVector = core::vector3df( 0.0f, 0.0f, 1.0f );
  rotMatrix.transformVect( targetVector );
  core::vector3df camTarget = position + targetVector;

  rotMatrix.transformVect( offset );

  _camera->setPosition( position + offset );
  _camera->setUpVector( camUpVector );
  _camera->setTarget( camTarget + offset );
  _camera->updateAbsolutePosition();
}

Please note, that this call updateAbsolutePosition() after all is very important to avoid some jitter. The problem is, that Irrlicht updates its positions _after_ rendering...

Regards - Xaron

[mystic jimbo]

OK, thanks for the code Xaron!