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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) Blender Foundation.
* All rights reserved.
*/
#pragma once
/** \file
* \ingroup bke
*/
#include "BLI_math.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Regularized Kelvinlets: Sculpting Brushes based on Fundamental Solutions of Elasticity
* Pixar Technical Memo #17-03 */
#define KELVINLET_MAX_ITERATIONS 3
typedef struct KelvinletParams {
float a;
float b;
float c;
float f;
float radius_scaled[KELVINLET_MAX_ITERATIONS];
} KelvinletParams;
/* Initialize KelvinletParams to store the parameters that will affect the deformation produced by
* a Kelvinlet */
void BKE_kelvinlet_init_params(
KelvinletParams *params, float radius, float force, float shear_modulus, float poisson_ratio);
/* Regularized Kelvinlets */
/* All these functions output the displacement that should be applied to each element. */
/* The initial coordinates of that element should not be modified during the transformation */
void BKE_kelvinlet_grab(float radius_elem_disp[3],
const KelvinletParams *params,
const float elem_orig_co[3],
const float brush_location[3],
const float brush_delta[3]);
void BKE_kelvinlet_grab_biscale(float radius_elem_disp[3],
const KelvinletParams *params,
const float elem_orig_co[3],
const float brush_location[3],
const float brush_delta[3]);
void BKE_kelvinlet_grab_triscale(float radius_elem_disp[3],
const KelvinletParams *params,
const float elem_orig_co[3],
const float brush_location[3],
const float brush_delta[3]);
void BKE_kelvinlet_scale(float radius_elem_disp[3],
const KelvinletParams *params,
const float elem_orig_co[3],
const float brush_location[3],
const float surface_normal[3]);
void BKE_kelvinlet_twist(float radius_elem_disp[3],
const KelvinletParams *params,
const float elem_orig_co[3],
const float brush_location[3],
const float surface_normal[3]);
#ifdef __cplusplus
}
#endif
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