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/*
* 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) 2006 by NaN Holding BV.
* All rights reserved.
*/
/** \file
* \ingroup DNA
*/
#ifndef __DNA_CLOTH_TYPES_H__
#define __DNA_CLOTH_TYPES_H__
#include "DNA_defs.h"
/**
* This struct contains all the global data required to run a simulation.
* At the time of this writing, this structure contains data appropriate
* to run a simulation as described in Deformation Constraints in a
* Mass-Spring Model to Describe Rigid Cloth Behavior by Xavier Provot.
*
* I've tried to keep similar, if not exact names for the variables as
* are presented in the paper. Where I've changed the concept slightly,
* as in stepsPerFrame compared to the time step in the paper, I've used
* variables with different names to minimize confusion.
*/
typedef struct ClothSimSettings {
/** UNUSED atm. */
struct LinkNode *cache;
/** See SB. */
float mingoal;
/** Mechanical damping of springs. */
float Cdis DNA_DEPRECATED;
/** Viscous/fluid damping. */
float Cvi;
/** Gravity/external force vector. */
float gravity[3];
/** This is the duration of our time step, computed.. */
float dt;
/** The mass of the entire cloth. */
float mass;
/** Structural spring stiffness. */
float structural DNA_DEPRECATED;
/** Shear spring stiffness. */
float shear;
/** Flexion spring stiffness. */
float bending;
/** Max bending scaling value, min is "bending". */
float max_bend;
/** Max structural scaling value, min is "structural". */
float max_struct DNA_DEPRECATED;
/** Max shear scaling value. */
float max_shear;
/** Max sewing force. */
float max_sewing;
/** Used for normalized springs. */
float avg_spring_len;
/** Parameter how fast cloth runs. */
float timescale;
/** Multiplies cloth speed. */
float time_scale;
/** See SB. */
float maxgoal;
/** Scaling of effector forces (see softbody_calc_forces)..*/
float eff_force_scale;
/** Scaling of effector wind (see softbody_calc_forces).. */
float eff_wind_scale;
float sim_time_old;
float defgoal;
float goalspring;
float goalfrict;
/** Smoothing of velocities for hair. */
float velocity_smooth;
/** Minimum density for hair. */
float density_target;
/** Influence of hair density. */
float density_strength;
/** Friction with colliders. */
float collider_friction;
/** Damp the velocity to speed up getting to the resting position. */
float vel_damping DNA_DEPRECATED;
/** Min amount to shrink cloth by 0.0f (no shrink), 1.0f (shrink to nothing), -1.0f (double the
* edge length). */
float shrink_min;
/** Max amount to shrink cloth by 0.0f (no shrink), 1.0f (shrink to nothing), -1.0f (double the
* edge length). */
float shrink_max;
/* Air pressure */
/* The uniform pressure that is constanty applied to the mesh. Can be negative */
float uniform_pressure_force;
/* User set volume. This is the volume the mesh wants to expand to (the equilibrium volume). */
float target_volume;
/* The scaling factor to apply to the actual pressure.
pressure=( (current_volume/target_volume) - 1 + uniform_pressure_force) *
pressure_factor */
float pressure_factor;
/* Density of the fluid inside or outside the object for use in the hydrostatic pressure
* gradient. */
float fluid_density;
short vgroup_pressure;
char _pad7[6];
/* XXX various hair stuff
* should really be separate, this struct is a horrible mess already
*/
/** Damping of bending springs. */
float bending_damping;
/** Size of voxel grid cells for continuum dynamics. */
float voxel_cell_size;
/** Number of time steps per frame. */
int stepsPerFrame;
/** Flags, see CSIMSETT_FLAGS enum above. */
int flags;
/** How many frames of simulation to do before we start. */
int preroll DNA_DEPRECATED;
/** In percent!; if tearing enabled, a spring will get cut. */
int maxspringlen;
/** Which solver should be used? txold. */
short solver_type;
/** Vertex group for scaling bending stiffness. */
short vgroup_bend;
/** Optional vertexgroup name for assigning weight..*/
short vgroup_mass;
/** Vertex group for scaling structural stiffness. */
short vgroup_struct;
/** Vertex group for shrinking cloth. */
short vgroup_shrink;
/** Vertex group for scaling structural stiffness. */
short shapekey_rest;
/** Used for presets on GUI. */
short presets;
short reset;
struct EffectorWeights *effector_weights;
short bending_model;
/** Vertex group for scaling structural stiffness. */
short vgroup_shear;
float tension;
float compression;
float max_tension;
float max_compression;
/** Mechanical damping of tension springs. */
float tension_damp;
/** Mechanical damping of compression springs. */
float compression_damp;
/** Mechanical damping of shear springs. */
float shear_damp;
/** The maximum lenght an internal spring can have during creation. */
float internal_spring_max_length;
/** How much the interal spring can diverge from the vertex normal during creation. */
float internal_spring_max_diversion;
/** Vertex group for scaling structural stiffness. */
short vgroup_intern;
char _pad1[2];
float internal_tension;
float internal_compression;
float max_internal_tension;
float max_internal_compression;
char _pad0[4];
} ClothSimSettings;
typedef struct ClothCollSettings {
/** E.g. pointer to temp memory for collisions. */
struct LinkNode *collision_list;
/** Min distance for collisions. */
float epsilon;
/** Fiction/damping with self contact. */
float self_friction;
/** Friction/damping applied on contact with other object. */
float friction;
/** Collision restitution on contact with other object. */
float damping;
/** For selfcollision. */
float selfepsilon;
float repel_force DNA_DEPRECATED;
float distance_repel DNA_DEPRECATED;
/** Collision flags defined in BKE_cloth.h. */
int flags;
/** How many iterations for the selfcollision loop. */
short self_loop_count DNA_DEPRECATED;
/** How many iterations for the collision loop. */
short loop_count;
char _pad[4];
/** Only use colliders from this group of objects. */
struct Collection *group;
/** Vgroup to paint which vertices are used for self collisions. */
short vgroup_selfcol;
char _pad2[6];
/** Impulse clamp for object collisions. */
float clamp;
/** Impulse clamp for self collisions. */
float self_clamp;
} ClothCollSettings;
#endif
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