[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [41838] trunk/blender: Cycles: Oren-Nayar BSDF support.
Brecht Van Lommel
brechtvanlommel at pandora.be
Mon Nov 14 18:31:47 CET 2011
Revision: 41838
http://projects.blender.org/scm/viewvc.php?view=rev&root=bf-blender&revision=41838
Author: blendix
Date: 2011-11-14 17:31:47 +0000 (Mon, 14 Nov 2011)
Log Message:
-----------
Cycles: Oren-Nayar BSDF support. This is not a separate shader node, rather it
is available through the Roughness input on the Diffuse BSDF.
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#Diffuse
Patch by Yasuhiro Fujii, thanks!
Modified Paths:
--------------
trunk/blender/intern/cycles/kernel/CMakeLists.txt
trunk/blender/intern/cycles/kernel/osl/CMakeLists.txt
trunk/blender/intern/cycles/kernel/osl/nodes/node_diffuse_bsdf.osl
trunk/blender/intern/cycles/kernel/osl/nodes/stdosl.h
trunk/blender/intern/cycles/kernel/osl/osl_closures.cpp
trunk/blender/intern/cycles/kernel/osl/osl_closures.h
trunk/blender/intern/cycles/kernel/svm/svm_bsdf.h
trunk/blender/intern/cycles/kernel/svm/svm_closure.h
trunk/blender/intern/cycles/kernel/svm/svm_types.h
trunk/blender/intern/cycles/render/nodes.cpp
trunk/blender/source/blender/gpu/intern/gpu_shader_material.glsl
trunk/blender/source/blender/gpu/intern/gpu_shader_material.glsl.c
trunk/blender/source/blender/nodes/shader/nodes/node_shader_bsdf_diffuse.c
Added Paths:
-----------
trunk/blender/intern/cycles/kernel/osl/bsdf_oren_nayar.cpp
trunk/blender/intern/cycles/kernel/svm/bsdf_oren_nayar.h
Modified: trunk/blender/intern/cycles/kernel/CMakeLists.txt
===================================================================
--- trunk/blender/intern/cycles/kernel/CMakeLists.txt 2011-11-14 16:34:11 UTC (rev 41837)
+++ trunk/blender/intern/cycles/kernel/CMakeLists.txt 2011-11-14 17:31:47 UTC (rev 41838)
@@ -42,6 +42,7 @@
svm/bsdf.h
svm/bsdf_ashikhmin_velvet.h
svm/bsdf_diffuse.h
+ svm/bsdf_oren_nayar.h
svm/bsdf_microfacet.h
svm/bsdf_reflection.h
svm/bsdf_refraction.h
Modified: trunk/blender/intern/cycles/kernel/osl/CMakeLists.txt
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/CMakeLists.txt 2011-11-14 16:34:11 UTC (rev 41837)
+++ trunk/blender/intern/cycles/kernel/osl/CMakeLists.txt 2011-11-14 17:31:47 UTC (rev 41838)
@@ -12,6 +12,7 @@
background.cpp
bsdf_ashikhmin_velvet.cpp
bsdf_diffuse.cpp
+ bsdf_oren_nayar.cpp
bsdf_microfacet.cpp
bsdf_reflection.cpp
bsdf_refraction.cpp
Added: trunk/blender/intern/cycles/kernel/osl/bsdf_oren_nayar.cpp
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/bsdf_oren_nayar.cpp (rev 0)
+++ trunk/blender/intern/cycles/kernel/osl/bsdf_oren_nayar.cpp 2011-11-14 17:31:47 UTC (rev 41838)
@@ -0,0 +1,174 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/*
+ * An implementation of Oren-Nayar reflectance model, public domain
+ * http://www1.cs.columbia.edu/CAVE/publications/pdfs/Oren_SIGGRAPH94.pdf
+ *
+ * NOTE:
+ * BSDF = A + B * cos() * sin() * tan()
+ *
+ * The parameter sigma means different from original.
+ * A and B are calculated by the following formula:
+ * 0 <= sigma <= 1
+ * A = 1 / ((1 + sigma / 2) * pi);
+ * B = sigma / ((1 + sigma / 2) * pi);
+ *
+ * This formula is derived as following:
+ *
+ * 0. Normalize A-term and B-term of BSDF *individually*.
+ * B-term is normalized at maximum point: dot(L, N) = 0.
+ * A = (1/pi) * A'
+ * B = (2/pi) * B'
+ *
+ * 1. Solve the following equation:
+ * A' + B' = 1
+ * B / A = sigma
+ */
+
+#include <OpenImageIO/fmath.h>
+#include <OSL/genclosure.h>
+#include "osl_closures.h"
+
+CCL_NAMESPACE_BEGIN
+
+using namespace OSL;
+
+
+class OrenNayarClosure: public BSDFClosure {
+public:
+ Vec3 m_N;
+ float m_sigma;
+ float m_a, m_b;
+
+ OrenNayarClosure(): BSDFClosure(Labels::DIFFUSE) {}
+
+ void setup() {
+ m_sigma = clamp(m_sigma, 0.0f, 1.0f);
+ m_a = 1.0f / ((1.0f + 0.5f * m_sigma) * M_PI);
+ m_b = m_sigma / ((1.0f + 0.5f * m_sigma) * M_PI);
+ }
+
+ bool mergeable(const ClosurePrimitive* other) const {
+ const OrenNayarClosure* comp = static_cast<const OrenNayarClosure*>(other);
+ return
+ m_N == comp->m_N &&
+ m_sigma == comp->m_sigma &&
+ BSDFClosure::mergeable(other);
+ }
+
+ size_t memsize() const {
+ return sizeof(*this);
+ }
+
+ const char* name() const {
+ return "oren_nayar";
+ }
+
+ void print_on(std::ostream& out) const {
+ out << name() << " (";
+ out << "(" << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ";
+ out << m_sigma;
+ out << ")";
+ }
+
+ float albedo(const Vec3& omega_out) const {
+ return 1.0f;
+ }
+
+ Color3 eval_reflect(const Vec3& omega_out, const Vec3& omega_in, float& pdf) const {
+ if (m_N.dot(omega_in) > 0.0f) {
+ pdf = float(0.5 * M_1_PI);
+ float is = get_intensity(m_N, omega_out, omega_in);
+ return Color3(is, is, is);
+ }
+ else {
+ pdf = 0.0f;
+ return Color3(0.0f, 0.0f, 0.0f);
+ }
+ }
+
+ Color3 eval_transmit(const Vec3& omega_out, const Vec3& omega_in, float& pdf) const {
+ return Color3(0.0f, 0.0f, 0.0f);
+ }
+
+ ustring sample(
+ const Vec3& Ng,
+ const Vec3& omega_out, const Vec3& domega_out_dx, const Vec3& domega_out_dy,
+ float randu, float randv,
+ Vec3& omega_in, Vec3& domega_in_dx, Vec3& domega_in_dy,
+ float& pdf, Color3& eval
+ ) const {
+ sample_uniform_hemisphere (m_N, omega_out, randu, randv, omega_in, pdf);
+
+ if (Ng.dot(omega_in) > 0.0f) {
+ float is = get_intensity(m_N, omega_out, omega_in);
+ eval.setValue(is, is, is);
+
+ // TODO: find a better approximation for the bounce
+ domega_in_dx = (2.0f * m_N.dot(domega_out_dx)) * m_N - domega_out_dx;
+ domega_in_dy = (2.0f * m_N.dot(domega_out_dy)) * m_N - domega_out_dy;
+ domega_in_dx *= 125.0f;
+ domega_in_dy *= 125.0f;
+ }
+ else {
+ pdf = 0.0f;
+ }
+
+ return Labels::REFLECT;
+ }
+
+private:
+ float get_intensity(Vec3 const& n, Vec3 const& v, Vec3 const& l) const {
+ float nl = max(n.dot(l), 0.0f);
+ float nv = max(n.dot(v), 0.0f);
+
+ Vec3 al = l - nl * n;
+ al.normalize();
+ Vec3 av = v - nv * n;
+ av.normalize();
+ float t = max(al.dot(av), 0.0f);
+
+ float cos_a, cos_b;
+ if (nl < nv) {
+ cos_a = nl;
+ cos_b = nv;
+ }
+ else {
+ cos_a = nv;
+ cos_b = nl;
+ }
+
+ float sin_a = sqrtf(1.0f - cos_a * cos_a);
+ float tan_b = sqrtf(1.0f - cos_b * cos_b) / (cos_b + FLT_MIN);
+
+ return nl * (m_a + m_b * t * sin_a * tan_b);
+ }
+};
+
+ClosureParam bsdf_oren_nayar_params[] = {
+ CLOSURE_VECTOR_PARAM (OrenNayarClosure, m_N),
+ CLOSURE_FLOAT_PARAM (OrenNayarClosure, m_sigma),
+ CLOSURE_STRING_KEYPARAM ("label"),
+ CLOSURE_FINISH_PARAM (OrenNayarClosure)
+};
+
+CLOSURE_PREPARE(bsdf_oren_nayar_prepare, OrenNayarClosure)
+
+
+CCL_NAMESPACE_END
Modified: trunk/blender/intern/cycles/kernel/osl/nodes/node_diffuse_bsdf.osl
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/nodes/node_diffuse_bsdf.osl 2011-11-14 16:34:11 UTC (rev 41837)
+++ trunk/blender/intern/cycles/kernel/osl/nodes/node_diffuse_bsdf.osl 2011-11-14 17:31:47 UTC (rev 41838)
@@ -20,9 +20,13 @@
shader node_diffuse_bsdf(
color Color = color(0.8, 0.8, 0.8),
+ float Roughness = 0.0,
normal Normal = N,
output closure color BSDF = diffuse(Normal))
{
- BSDF = Color*diffuse(Normal);
+ if(Roughness == 0.0)
+ BSDF = Color * diffuse(Normal);
+ else
+ BSDF = Color * oren_nayar(Normal, Roughness);
}
Modified: trunk/blender/intern/cycles/kernel/osl/nodes/stdosl.h
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/nodes/stdosl.h 2011-11-14 16:34:11 UTC (rev 41837)
+++ trunk/blender/intern/cycles/kernel/osl/nodes/stdosl.h 2011-11-14 17:31:47 UTC (rev 41838)
@@ -435,6 +435,7 @@
// Closures
closure color diffuse(normal N) BUILTIN;
+closure color oren_nayar(normal N, float sigma) BUILTIN;
closure color translucent(normal N) BUILTIN;
closure color reflection(normal N, float eta) BUILTIN;
closure color reflection(normal N) { return reflection (N, 0.0); }
Modified: trunk/blender/intern/cycles/kernel/osl/osl_closures.cpp
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/osl_closures.cpp 2011-11-14 16:34:11 UTC (rev 41837)
+++ trunk/blender/intern/cycles/kernel/osl/osl_closures.cpp 2011-11-14 17:31:47 UTC (rev 41838)
@@ -69,6 +69,7 @@
void OSLShader::register_closures(OSL::ShadingSystem *ss)
{
register_closure(ss, "diffuse", OSL_CLOSURE_BSDF_DIFFUSE_ID, bsdf_diffuse_params, bsdf_diffuse_prepare);
+ register_closure(ss, "oren_nayar", OSL_CLOSURE_BSDF_OREN_NAYAR_ID, bsdf_oren_nayar_params, bsdf_oren_nayar_prepare);
register_closure(ss, "translucent", OSL_CLOSURE_BSDF_TRANSLUCENT_ID, bsdf_translucent_params, bsdf_translucent_prepare);
register_closure(ss, "reflection", OSL_CLOSURE_BSDF_REFLECTION_ID, bsdf_reflection_params, bsdf_reflection_prepare);
register_closure(ss, "refraction", OSL_CLOSURE_BSDF_REFRACTION_ID, bsdf_refraction_params, bsdf_refraction_prepare);
Modified: trunk/blender/intern/cycles/kernel/osl/osl_closures.h
===================================================================
--- trunk/blender/intern/cycles/kernel/osl/osl_closures.h 2011-11-14 16:34:11 UTC (rev 41837)
+++ trunk/blender/intern/cycles/kernel/osl/osl_closures.h 2011-11-14 17:31:47 UTC (rev 41838)
@@ -41,6 +41,7 @@
enum {
OSL_CLOSURE_BSDF_DIFFUSE_ID,
+ OSL_CLOSURE_BSDF_OREN_NAYAR_ID,
OSL_CLOSURE_BSDF_TRANSLUCENT_ID,
OSL_CLOSURE_BSDF_REFLECTION_ID,
OSL_CLOSURE_BSDF_REFRACTION_ID,
@@ -62,6 +63,7 @@
};
extern OSL::ClosureParam bsdf_diffuse_params[];
+extern OSL::ClosureParam bsdf_oren_nayar_params[];
extern OSL::ClosureParam bsdf_translucent_params[];
extern OSL::ClosureParam bsdf_reflection_params[];
extern OSL::ClosureParam bsdf_refraction_params[];
@@ -82,6 +84,7 @@
extern OSL::ClosureParam closure_subsurface_params[];
void bsdf_diffuse_prepare(OSL::RendererServices *, int id, void *data);
+void bsdf_oren_nayar_prepare(OSL::RendererServices *, int id, void *data);
void bsdf_translucent_prepare(OSL::RendererServices *, int id, void *data);
void bsdf_reflection_prepare(OSL::RendererServices *, int id, void *data);
void bsdf_refraction_prepare(OSL::RendererServices *, int id, void *data);
Added: trunk/blender/intern/cycles/kernel/svm/bsdf_oren_nayar.h
===================================================================
--- trunk/blender/intern/cycles/kernel/svm/bsdf_oren_nayar.h (rev 0)
+++ trunk/blender/intern/cycles/kernel/svm/bsdf_oren_nayar.h 2011-11-14 17:31:47 UTC (rev 41838)
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
@@ Diff output truncated at 10240 characters. @@
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