diff options
Diffstat (limited to 'intern/cycles/kernel/osl/vol_subsurface.cpp')
| -rw-r--r-- | intern/cycles/kernel/osl/vol_subsurface.cpp | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/intern/cycles/kernel/osl/vol_subsurface.cpp b/intern/cycles/kernel/osl/vol_subsurface.cpp deleted file mode 100644 index 5845428ed43..00000000000 --- a/intern/cycles/kernel/osl/vol_subsurface.cpp +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Adapted from Open Shading Language with this license: - * - * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al. - * All Rights Reserved. - * - * Modifications Copyright 2011, Blender Foundation. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * * Neither the name of Sony Pictures Imageworks nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <OpenImageIO/fmath.h> - -#include <OSL/genclosure.h> - -#include "osl_closures.h" - -CCL_NAMESPACE_BEGIN - -using namespace OSL; - -// Computes scattering properties based on Jensen's reparameterization -// described in: -// http://graphics.ucsd.edu/~henrik/papers/fast_bssrdf/ - -class SubsurfaceClosure : public VolumeClosure { -public: - float m_g; - float m_eta; - Color3 m_mfp, m_albedo; - static float root_find_Rd(const float Rd0, const float A) { - // quick exit for trivial cases - if (Rd0 <= 0) return 0; - const float A43 = A * 4.0f / 3.0f; - // Find alpha such that f(alpha) = Rd (see eq.15). A simple bisection - // method can be used because this function is monotonicaly increasing. - float lo = 0, hi = 1; - for (int i = 0; i < 20; i++) { // 2^20 divisions should be sufficient - // eval function at midpoint - float alpha = 0.5f * (lo + hi); - float a1 = sqrtf(3 * (1 - alpha)); - float e1 = expf(-a1); - float e2 = expf(-A43 * a1); - float Rd = 0.5f * alpha * (1 + e2) * e1 - Rd0; - if (fabsf(Rd) < 1e-6f) - return alpha; // close enough - else if (Rd > 0) - hi = alpha; // root is on left side - else - lo = alpha; // root is on right side - } - // didn't quite converge, pick result in the middle of remaining interval - return 0.5f * (lo + hi); - } - SubsurfaceClosure() { - } - - void setup() - { - ior(m_eta); - - if (m_g >= 0.99f) m_g = 0.99f; - if (m_g <= -0.99f) m_g = -0.99f; - - // eq.10 - float inv_eta = 1 / m_eta; - float Fdr = -1.440f * inv_eta * inv_eta + 0.710 * inv_eta + 0.668f + 0.0636 * m_eta; - float A = (1 + Fdr) / (1 - Fdr); - // compute sigma_s, sigma_a (eq.16) - Color3 alpha_prime = Color3(root_find_Rd(m_albedo[0], A), - root_find_Rd(m_albedo[1], A), - root_find_Rd(m_albedo[2], A)); - Color3 sigma_t_prime = Color3(m_mfp.x > 0 ? 1.0f / (m_mfp[0] * sqrtf(3 * (1 - alpha_prime[0]))) : 0.0f, - m_mfp.y > 0 ? 1.0f / (m_mfp[1] * sqrtf(3 * (1 - alpha_prime[1]))) : 0.0f, - m_mfp.z > 0 ? 1.0f / (m_mfp[2] * sqrtf(3 * (1 - alpha_prime[2]))) : 0.0f); - Color3 sigma_s_prime = alpha_prime * sigma_t_prime; - - sigma_s((1.0f / (1 - m_g)) * sigma_s_prime); - sigma_a(sigma_t_prime - sigma_s_prime); - } - - bool mergeable(const ClosurePrimitive *other) const { - const SubsurfaceClosure *comp = (const SubsurfaceClosure *)other; - return m_g == comp->m_g && VolumeClosure::mergeable(other); - } - - size_t memsize() const { return sizeof(*this); } - - const char *name() const { return "subsurface"; } - - void print_on(std::ostream &out) const { - out << name() << " ()"; - } - - virtual Color3 eval_phase(const Vec3 &omega_in, const Vec3 &omega_out) const { - float costheta = omega_in.dot(omega_out); - float ph = 0.25f * float(M_1_PI) * ((1 - m_g * m_g) / powf(1 + m_g * m_g - 2.0f * m_g * costheta, 1.5f)); - return Color3(ph, ph, ph); - } -}; - - - -ClosureParam *closure_subsurface_params() -{ - static ClosureParam params[] = { - CLOSURE_FLOAT_PARAM(SubsurfaceClosure, m_eta), - CLOSURE_FLOAT_PARAM(SubsurfaceClosure, m_g), - CLOSURE_COLOR_PARAM(SubsurfaceClosure, m_mfp), - CLOSURE_COLOR_PARAM(SubsurfaceClosure, m_albedo), - CLOSURE_STRING_KEYPARAM("label"), - CLOSURE_FINISH_PARAM(SubsurfaceClosure) - }; - return params; -} - -CLOSURE_PREPARE(closure_subsurface_prepare, SubsurfaceClosure) - -CCL_NAMESPACE_END - |