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Originally I only implemented pitch->yaw->roll, and being new to all this
didn't fully appreciate the limitation that resulted in.
This adds all six permutations of pitch/yaw/roll, the scene must specify
the desired order when setting up the camera with the euler angles, see
the enum in ray_euler.h.
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trace_ray() bumps the depth, the reflection ray trace_ray() call just needs to
propagate the depth variable not advance it as well. This was probably
vestigial from early development and never got taken out.
This does mean more reflections now, and correspondingly slower rendering, but
it at least makes MAX_RECURSION_DEPTH accurate. The define can be changed if
the performance is too bad.
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The relative path broke out-of-tree builds.
Previously the following:
$ mkdir /tmp/foo
$ cd /tmp/foo
$ ~/src/rototiller/configure
$ make
Would fail to compile unable to locate the headers in
~/rototiller/src
This fixes it.
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Restoring some organizational sanity since adopting autotools.
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