VRED - Virtual Reality Editor - PI-VR GmbH

More documents

Recommendations

Info

3.19. TRACKING 3. USER INTERFACE 3.19.2 Coordinate Systems The main difficulty with tracking lays within the three different coordinate systems that have to be considered: • Scene coordinate system. This is the coordinate system of your virtual world, that is the scene loaded into VRED. Note that all virtual representation of bodies must be transform nodes. These use a local coordinate system that is determined by the product of all transform nodes above itself. • Tracking coordinate system. The tracking coordinate system belongs to the tracking hardware. This coordinate system may be the same as the physical coordinate system of your application, but it may also be completely different, concerning both the origin and the orientation. • Physical coordinate system. The physical coordinate system is that of the real world and is normally defined by your needs (e.g. where the origin is and the orientation). The difficult task is to get these three coordinate systems working together. Fortunately VRED has some built-in capabilities to calibrate the coordinate systems to easily change the origin or orientation. But still, you - as the user - have to be aware of what you are doing and how the coordinate systems should be mapped on each other. 173
3.19. TRACKING 3. USER INTERFACE Figure 3.124: An example of a tracking setup, where both the tracking coordinate system and the bodies coincide with their virtual representations. Hint Of course it is the easiest, when all three coordinate systems are the same – but in most cases this is not possible. But a careful design of the scene and the setup in the physical world can guarantee that these two coordinate systems are the same. Plus it is much easier if the orientation of the tracking coordinate system and of the virtual scene is the same. This might require a recalibration of the tracking system with the original tracking software. 3.19.3 Calibration In order to help the user at bringing together the three different coordinate systems, VRED offers the ability to cali- 174
Page 1 and 2: 3.19. TRACKING 3. USER INTERFACE 3.
Page 3: 3.19. TRACKING 3. USER INTERFACE ne
Page 7 and 8: 3.19. TRACKING 3. USER INTERFACE Fi
Page 9 and 10: 3.19. TRACKING 3. USER INTERFACE 3.
Page 11 and 12: 3.19. TRACKING 3. USER INTERFACE
Page 13: 3.19. TRACKING 3. USER INTERFACE Fi

VRED - Virtual Reality Editor - PI-VR GmbH

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?