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Diffstat (limited to 'source/blender/physics/intern/implicit.h')
| -rw-r--r-- | source/blender/physics/intern/implicit.h | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/source/blender/physics/intern/implicit.h b/source/blender/physics/intern/implicit.h new file mode 100644 index 00000000000..d286d3df1a5 --- /dev/null +++ b/source/blender/physics/intern/implicit.h @@ -0,0 +1,186 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * 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. + * + * The Original Code is Copyright (C) Blender Foundation + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): Lukas Toenne + * + * ***** END GPL LICENSE BLOCK ***** + */ + +#ifndef __IMPLICIT_H__ +#define __IMPLICIT_H__ + +/** \file implicit.h + * \ingroup bph + */ + +#include "stdio.h" + +#include "BLI_utildefines.h" + +#include "BKE_collision.h" + +#ifdef __cplusplus +extern "C" { +#endif + +//#define IMPLICIT_SOLVER_EIGEN +#define IMPLICIT_SOLVER_BLENDER + +#define CLOTH_ROOT_FRAME /* enable use of root frame coordinate transform */ + +#define CLOTH_FORCE_GRAVITY +#define CLOTH_FORCE_DRAG +#define CLOTH_FORCE_SPRING_STRUCTURAL +#define CLOTH_FORCE_SPRING_BEND +#define CLOTH_FORCE_SPRING_GOAL +#define CLOTH_FORCE_EFFECTORS + +//#define IMPLICIT_PRINT_SOLVER_INPUT_OUTPUT + +//#define IMPLICIT_ENABLE_EIGEN_DEBUG + +struct Implicit_Data; +struct ImplicitSolverInput; + +typedef struct ImplicitSolverResult { + int status; + + int iterations; + float error; +} ImplicitSolverResult; + +BLI_INLINE void implicit_print_matrix_elem(float v) +{ + printf("%-8.3f", v); +} + +void BPH_mass_spring_set_vertex_mass(struct Implicit_Data *data, int index, float mass); +void BPH_mass_spring_set_rest_transform(struct Implicit_Data *data, int index, float rot[3][3]); + +void BPH_mass_spring_set_motion_state(struct Implicit_Data *data, int index, const float x[3], const float v[3]); +void BPH_mass_spring_set_position(struct Implicit_Data *data, int index, const float x[3]); +void BPH_mass_spring_set_velocity(struct Implicit_Data *data, int index, const float v[3]); +void BPH_mass_spring_get_motion_state(struct Implicit_Data *data, int index, float x[3], float v[3]); +void BPH_mass_spring_get_position(struct Implicit_Data *data, int index, float x[3]); + +/* access to modified motion state during solver step */ +void BPH_mass_spring_get_new_position(struct Implicit_Data *data, int index, float x[3]); +void BPH_mass_spring_set_new_position(struct Implicit_Data *data, int index, const float x[3]); +void BPH_mass_spring_get_new_velocity(struct Implicit_Data *data, int index, float v[3]); +void BPH_mass_spring_set_new_velocity(struct Implicit_Data *data, int index, const float v[3]); + +void BPH_mass_spring_clear_constraints(struct Implicit_Data *data); +void BPH_mass_spring_add_constraint_ndof0(struct Implicit_Data *data, int index, const float dV[3]); +void BPH_mass_spring_add_constraint_ndof1(struct Implicit_Data *data, int index, const float c1[3], const float c2[3], const float dV[3]); +void BPH_mass_spring_add_constraint_ndof2(struct Implicit_Data *data, int index, const float c1[3], const float dV[3]); + +bool BPH_mass_spring_solve_velocities(struct Implicit_Data *data, float dt, struct ImplicitSolverResult *result); +bool BPH_mass_spring_solve_positions(struct Implicit_Data *data, float dt); +void BPH_mass_spring_apply_result(struct Implicit_Data *data); + +/* Clear the force vector at the beginning of the time step */ +void BPH_mass_spring_clear_forces(struct Implicit_Data *data); +/* Fictitious forces introduced by moving coordinate systems */ +void BPH_mass_spring_force_reference_frame(struct Implicit_Data *data, int index, const float acceleration[3], const float omega[3], const float domega_dt[3], float mass); +/* Simple uniform gravity force */ +void BPH_mass_spring_force_gravity(struct Implicit_Data *data, int index, float mass, const float g[3]); +/* Global drag force (velocity damping) */ +void BPH_mass_spring_force_drag(struct Implicit_Data *data, float drag); +/* Custom external force */ +void BPH_mass_spring_force_extern(struct Implicit_Data *data, int i, const float f[3], float dfdx[3][3], float dfdv[3][3]); +/* Wind force, acting on a face */ +void BPH_mass_spring_force_face_wind(struct Implicit_Data *data, int v1, int v2, int v3, int v4, const float (*winvec)[3]); +/* Wind force, acting on an edge */ +void BPH_mass_spring_force_edge_wind(struct Implicit_Data *data, int v1, int v2, float radius1, float radius2, const float (*winvec)[3]); +/* Wind force, acting on a vertex */ +void BPH_mass_spring_force_vertex_wind(struct Implicit_Data *data, int v, float radius, const float (*winvec)[3]); +/* Linear spring force between two points */ +bool BPH_mass_spring_force_spring_linear(struct Implicit_Data *data, int i, int j, float restlen, + float stiffness, float damping, bool no_compress, float clamp_force, + float r_f[3], float r_dfdx[3][3], float r_dfdv[3][3]); +/* Bending force, forming a triangle at the base of two structural springs */ +bool BPH_mass_spring_force_spring_bending(struct Implicit_Data *data, int i, int j, float restlen, + float kb, float cb, + float r_f[3], float r_dfdx[3][3], float r_dfdv[3][3]); +/* Angular bending force based on local target vectors */ +bool BPH_mass_spring_force_spring_bending_angular(struct Implicit_Data *data, int i, int j, int k, + const float target[3], float stiffness, float damping); +/* Global goal spring */ +bool BPH_mass_spring_force_spring_goal(struct Implicit_Data *data, int i, const float goal_x[3], const float goal_v[3], + float stiffness, float damping, + float r_f[3], float r_dfdx[3][3], float r_dfdv[3][3]); + +/* ======== Hair Volumetric Forces ======== */ + +struct HairGrid; + +struct Object; +struct VoxelData; + +#define MAX_HAIR_GRID_RES 256 + +struct HairGrid *BPH_hair_volume_create_vertex_grid(float cellsize, const float gmin[3], const float gmax[3]); +void BPH_hair_volume_free_vertex_grid(struct HairGrid *grid); +void BPH_hair_volume_grid_geometry(struct HairGrid *grid, float *cellsize, int res[3], float gmin[3], float gmax[3]); + +void BPH_hair_volume_grid_clear(struct HairGrid *grid); +void BPH_hair_volume_add_vertex(struct HairGrid *grid, const float x[3], const float v[3]); +void BPH_hair_volume_add_segment(struct HairGrid *grid, + const float x1[3], const float v1[3], const float x2[3], const float v2[3], + const float x3[3], const float v3[3], const float x4[3], const float v4[3], + const float dir1[3], const float dir2[3], const float dir3[3]); + +void BPH_hair_volume_normalize_vertex_grid(struct HairGrid *grid); + +bool BPH_hair_volume_solve_divergence(struct HairGrid *grid, float dt, float target_density, float target_strength); +#if 0 /* XXX weighting is incorrect, disabled for now */ +void BPH_hair_volume_vertex_grid_filter_box(struct HairVertexGrid *grid, int kernel_size); +#endif + +void BPH_hair_volume_grid_interpolate(struct HairGrid *grid, const float x[3], + float *density, float velocity[3], float velocity_smooth[3], + float density_gradient[3], float velocity_gradient[3][3]); + +/* Effect of fluid simulation grid on velocities. + * fluid_factor controls blending between PIC (Particle-in-Cell) + * and FLIP (Fluid-Implicit-Particle) methods (0 = only PIC, 1 = only FLIP) + */ +void BPH_hair_volume_grid_velocity(struct HairGrid *grid, const float x[3], const float v[3], + float fluid_factor, + float r_v[3]); +/* XXX Warning: expressing grid effects on velocity as a force is not very stable, + * due to discontinuities in interpolated values! + * Better use hybrid approaches such as described in + * "Detail Preserving Continuum Simulation of Straight Hair" + * (McAdams, Selle 2009) + */ +void BPH_hair_volume_vertex_grid_forces(struct HairGrid *grid, const float x[3], const float v[3], + float smoothfac, float pressurefac, float minpressure, + float f[3], float dfdx[3][3], float dfdv[3][3]); + +bool BPH_hair_volume_get_texture_data(struct HairGrid *grid, struct VoxelData *vd); + +#ifdef __cplusplus +} +#endif + +#endif |