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We can just assume the object which reflected the ray being tracing
isn't going to be intersected. Maybe later this assumption no longer
holds true, but it is true for now.
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This gets rid of some computation on the primary ray:plane intersection tests
The branches on depth suck though... I'm leaning towards specialized primary
ray intersection test functions.
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This gets rid of some computation on the primary ray:plane intersection tests
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To enable prepare to precompute aspects of primary rays which all have a
common origin at the camera, bring the camera to ray_object*_prepare() and
bring the depth to ray_object*_intersects_ray() for primary ray detection.
This is only scaffolding, functionally unchanged.
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This may need to be undone in the future when more sophisticated lights,
like area lights, are implemented. For now I can avoid polluting the
objects list with the lights by strictly separating them.
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Remove unnecessary nearest_object check, the distance comparison alone
is sufficient when initialized to INFINITY.
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Just tidying up shade_ray() before more optimizations.
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Trivially removes a ray_3f_mult_scalar() from the hot path.
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We can avoid some unnecessary work at the max depth by checking it in
shade_ray() instead.
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This is functionally identical.
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This function isn't currently used, but its implementation was awful.
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Need to normalize the direction when we step the y axis and @ start.
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powf() is slow but precise, this isn't the fastest method but it's
at least portable and a bit faster.
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It's only necessary to normalize the direction stored vector in x_step(),
the rest can simply be linearly interpolated which saves some divides.
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Simple optimization taking advantage of the prepare, mults generally
are cheaper than divs.
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Just embed a _prepared struct in the object where precomputed stuff can be
cached. Gets called once before rendering, which ends up calling the
object-specific ray_object_$type_prepare() methods per object.
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Prior to rototiller_module_t these headers were included
and the module-specific render functions called directly.
That's no longer the case, these files are irrelevant today.
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introduces create_context() and destroy_context() methods, and adds a
'void *context' first parameter to the module methods.
If a module doesn't supply create_context() then NULL is simply passed
around as the context, so trivial modules can continue to only implement
render_fragment().
A subsequent commit will update the modules to encapsulate their global
state in module-specific contexts.
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Now that rototiller is generally threaded when a prepare_frame() method is
supplied, and modules/ray has been updated accordingly, discard the now
redundant ray-specific threading code and related stuff.
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The ray tracer was already threaded, so this required little change other
than making some state global like the previous commits, and calling the
underlying non-threaded single-fragment scene renderer function.
A future commit will discard the now vestigial ray_threads related code.
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Adding more context to the name in anticipation of adding a prepare_frame()
method to the module struct.
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Make consistent with the source directory structure naming.
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The highlight on the little green sphere was white-washing
the entire thing due to its high specular reflection value.
This produces more reasonable results...
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Was a constant at 20, this allows it to be specified per-object.
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Make spheres a little more diverse in terms of specular/diffusion,
and minor tweak to the plane color.
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Make the camera orbit around the origin at a varying radius, with kept aimed
facing the origin, with some vertical sweep+tilt thrown in.
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We should only consider dot products > 0 as intersected, or >= something
very close to 0 (epsilon).
As-is resulted in planes moving with camera movement along the plane normal
axis.
Also fixes plane distance to be non-negative in the current scene.
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Leftover from debugging presumably
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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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