Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
This commit is contained in:
Ton Roosendaal
181
intern/cycles/kernel/osl/bsdf_diffuse.cpp
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181
intern/cycles/kernel/osl/bsdf_diffuse.cpp
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/*
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* Adapted from Open Shading Language with this license:
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*
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* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
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* All Rights Reserved.
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*
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* Modifications Copyright 2011, Blender Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Sony Pictures Imageworks nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <OpenImageIO/fmath.h>
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#include <OSL/genclosure.h>
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#include "osl_closures.h"
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CCL_NAMESPACE_BEGIN
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using namespace OSL;
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class DiffuseClosure : public BSDFClosure {
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public:
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Vec3 m_N;
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DiffuseClosure() : BSDFClosure(Labels::DIFFUSE) { }
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void setup() {};
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bool mergeable (const ClosurePrimitive *other) const {
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const DiffuseClosure *comp = (const DiffuseClosure *)other;
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return m_N == comp->m_N && BSDFClosure::mergeable(other);
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}
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size_t memsize () const { return sizeof(*this); }
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const char *name () const { return "diffuse"; }
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void print_on (std::ostream &out) const
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{
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out << name() << " ((" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "))";
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}
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float albedo (const Vec3 &omega_out) const
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{
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return 1.0f;
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}
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Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
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{
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float cos_pi = std::max(m_N.dot(omega_in),0.0f) * (float) M_1_PI;
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pdf = cos_pi;
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return Color3 (cos_pi, cos_pi, cos_pi);
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}
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Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
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{
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return Color3 (0, 0, 0);
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}
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ustring sample (const Vec3 &Ng,
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const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
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float randu, float randv,
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Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
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float &pdf, Color3 &eval) const
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{
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// we are viewing the surface from the right side - send a ray out with cosine
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// distribution over the hemisphere
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sample_cos_hemisphere (m_N, omega_out, randu, randv, omega_in, pdf);
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if (Ng.dot(omega_in) > 0) {
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eval.setValue(pdf, pdf, pdf);
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// TODO: find a better approximation for the diffuse bounce
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domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx;
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domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy;
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domega_in_dx *= 125;
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domega_in_dy *= 125;
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} else
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pdf = 0;
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return Labels::REFLECT;
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}
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};
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class TranslucentClosure : public BSDFClosure {
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public:
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Vec3 m_N;
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TranslucentClosure() : BSDFClosure(Labels::DIFFUSE, Back) { }
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void setup() {};
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bool mergeable (const ClosurePrimitive *other) const {
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const TranslucentClosure *comp = (const TranslucentClosure *)other;
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return m_N == comp->m_N && BSDFClosure::mergeable(other);
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}
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size_t memsize () const { return sizeof(*this); }
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const char *name () const { return "translucent"; }
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void print_on (std::ostream &out) const
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{
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out << name() << " ((" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "))";
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}
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Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
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{
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return Color3 (0, 0, 0);
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}
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float albedo (const Vec3 &omega_out) const
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{
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return 1.0f;
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}
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Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
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{
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float cos_pi = std::max(-m_N.dot(omega_in), 0.0f) * (float) M_1_PI;
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pdf = cos_pi;
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return Color3 (cos_pi, cos_pi, cos_pi);
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}
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ustring sample (const Vec3 &Ng,
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const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
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float randu, float randv,
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Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
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float &pdf, Color3 &eval) const
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{
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// we are viewing the surface from the right side - send a ray out with cosine
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// distribution over the hemisphere
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sample_cos_hemisphere (-m_N, omega_out, randu, randv, omega_in, pdf);
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if (Ng.dot(omega_in) < 0) {
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eval.setValue(pdf, pdf, pdf);
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// TODO: find a better approximation for the diffuse bounce
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domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx;
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domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy;
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domega_in_dx *= -125;
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domega_in_dy *= -125;
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} else
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pdf = 0;
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return Labels::TRANSMIT;
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}
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};
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ClosureParam bsdf_diffuse_params[] = {
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CLOSURE_VECTOR_PARAM (DiffuseClosure, m_N),
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CLOSURE_STRING_KEYPARAM("label"),
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CLOSURE_FINISH_PARAM (DiffuseClosure) };
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ClosureParam bsdf_translucent_params[] = {
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CLOSURE_VECTOR_PARAM (TranslucentClosure, m_N),
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CLOSURE_STRING_KEYPARAM("label"),
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CLOSURE_FINISH_PARAM (TranslucentClosure) };
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CLOSURE_PREPARE(bsdf_diffuse_prepare, DiffuseClosure)
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CLOSURE_PREPARE(bsdf_translucent_prepare, TranslucentClosure)
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CCL_NAMESPACE_END
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