Hi
When using rpict -z to get pixel distances, are these distances the distance
from viewpoint until it hits the first object, just like a laser range scanner?
Tarik
--
Tarik Rahman
PhD student, Institue of Perception, Action and Behaviour
School of Informatics
University of Edinburgh
From: Tarik Rahman <[email protected]>
Date: September 13, 2004 8:13:36 AM PDTHi
When using rpict -z to get pixel distances, are these distances the distance
from viewpoint until it hits the first object, just like a laser range scanner?
Yes, unless you have assigned a fore clipping plane (-vo option), in which case it is the distance from this plane (which may be a cylinder or a sphere for the -vtc, -vta and -vth options).
-Greg
Greg Ward wrote:
From: Tarik Rahman <[email protected]>
Date: September 13, 2004 8:13:36 AM PDTHi
When using rpict -z to get pixel distances, are these distances the distance
from viewpoint until it hits the first object, just like a laser range scanner?Yes, unless you have assigned a fore clipping plane (-vo option), in which case it is the distance from this plane (which may be a cylinder or a sphere for the -vtc, -vta and -vth options).
-Greg
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hint: http://www.pab-opto.de/radiance/special has a simulated laserscanner, which generates objects at the depth generated by "rpict -z"
-Peter
--
pab-opto, Freiburg, Germany, http://www.pab-opto.de
[see web page to check digital email signature]
Another caveat -- the -z output from rpict is the "effective ray length," not the distance to first intersection. This means that for glass or mirror surfaces, it may be the distance to the object seen through the glass or mirror rather than the distance to the glass or mirror surface itself.
If you really want the first object intersection distance, regardless of material type, you should use the vwrays command together with rtrace and the -oL option.
-Greg
From: Peter Apian-Bennewitz <[email protected]>
Date: September 13, 2004 10:42:00 AM PDTGreg Ward wrote:
From: Tarik Rahman <[email protected]>
Date: September 13, 2004 8:13:36 AM PDTHi
When using rpict -z to get pixel distances, are these distances the distance
from viewpoint until it hits the first object, just like a laser range scanner?Yes, unless you have assigned a fore clipping plane (-vo option), in which case it is the distance from this plane (which may be a cylinder or a sphere for the -vtc, -vta and -vth options).
-Greg