New feature

Patch [#33445] - Experimental Cycles Hair Rendering (CPU only)

This patch allows hair data to be exported to cycles and introduces a new line segment primitive to render with.

The UI appears under the particle tab and there is a new hair info node available.

It is only available under the experimental feature set and for cpu rendering.

intern/cycles/render/curves.h

@@ -0,0 +1,134 @@
+/*
+ * 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.
+ */
+
+#ifndef __CURVES_H__
+#define __CURVES_H__
+
+#include "util_types.h"
+#include "util_vector.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Device;
+class DeviceScene;
+class Progress;
+class Scene;
+
+typedef enum curve_presets {
+	CURVE_CUSTOM,
+	CURVE_TANGENT_SHADING,
+	CURVE_TRUE_NORMAL,
+	CURVE_ACCURATE_PRESET
+} curve_presets;
+
+typedef enum curve_primitives {
+	CURVE_TRIANGLES,
+	CURVE_LINE_SEGMENTS,
+	CURVE_SEGMENTS
+} curve_primitives;
+
+typedef enum curve_triangles {
+	CURVE_CAMERA,
+	CURVE_RIBBONS,
+	CURVE_TESSELATED
+} curve_triangles;
+
+typedef enum curve_lines {
+	CURVE_ACCURATE,
+	CURVE_CORRECTED,
+	CURVE_POSTCORRECTED,
+	CURVE_UNCORRECTED
+} curve_lines;
+
+typedef enum curve_interpolation {
+	CURVE_LINEAR,
+	CURVE_CARDINAL,
+	CURVE_BSPLINE
+} curve_interpolation;
+
+class ParticleCurveData {
+
+public:
+
+	ParticleCurveData();
+	~ParticleCurveData();
+
+	vector<int> psys_firstcurve;
+	vector<int> psys_curvenum;
+	vector<int> psys_shader;
+
+	vector<float> psys_rootradius;
+	vector<float> psys_tipradius;
+	vector<float> psys_shape;
+	vector<bool> psys_closetip;
+
+	vector<int> curve_firstkey;
+	vector<int> curve_keynum;
+	vector<float> curve_length;
+	vector<float> curve_u;
+	vector<float> curve_v;
+
+	vector<float3> curvekey_co;
+	vector<float> curvekey_time;
+};
+
+/* HairSystem Manager */
+
+class CurveSystemManager {
+public:
+
+	int primitive;
+	int line_method;
+	int interpolation;
+	int triangle_method;
+	int resolution;
+	int segments;
+
+	float normalmix;
+	float encasing_ratio;
+
+	bool use_curves;
+	bool use_smooth;
+	bool use_cache;
+	bool use_parents;
+	bool use_encasing;
+	bool use_backfacing;
+	bool use_tangent_normal;
+	bool use_tangent_normal_correction;
+	bool use_tangent_normal_geometry;
+	bool use_joined;
+
+	bool need_update;
+	bool need_mesh_update;
+
+	CurveSystemManager();
+	~CurveSystemManager();
+
+	void device_update(Device *device, DeviceScene *dscene, Scene *scene, Progress& progress);
+	void device_free(Device *device, DeviceScene *dscene);
+	bool modified(const CurveSystemManager& CurveSystemManager);
+	bool modified_mesh(const CurveSystemManager& CurveSystemManager);
+
+	void tag_update(Scene *scene);
+	void tag_update_mesh();
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __CURVES_H__ */
+