86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) Blender Foundation.
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* All rights reserved.
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*/
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#ifndef __BKE_KELVINLET_H__
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#define __BKE_KELVINLET_H__
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/** \file
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* \ingroup bke
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*/
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#include "BLI_math.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Regularized Kelvinlets: Sculpting Brushes based on Fundamental Solutions of Elasticity
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* Pixar Technical Memo #17-03 */
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#define KELVINLET_MAX_ITERATIONS 3
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typedef struct KelvinletParams {
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float a;
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float b;
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float c;
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float f;
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float radius_scaled[KELVINLET_MAX_ITERATIONS];
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} KelvinletParams;
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/* Initialize KelvinletParams to store the parameters that will affect the deformation produced by
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* a Kelvinlet */
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void BKE_kelvinlet_init_params(
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KelvinletParams *params, float radius, float force, float shear_modulus, float poisson_ratio);
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/* Regularized Kelvinlets */
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/* All these functions output the displacement that should be applied to each element. */
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/* The initial coordinates of that element should not be modified during the transformation */
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void BKE_kelvinlet_grab(float r_elem_disp[3],
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const KelvinletParams *params,
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const float elem_orig_co[3],
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const float brush_location[3],
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const float brush_delta[3]);
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void BKE_kelvinlet_grab_biscale(float r_elem_disp[3],
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const KelvinletParams *params,
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const float elem_orig_co[3],
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const float brush_location[3],
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const float brush_delta[3]);
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void BKE_kelvinlet_grab_triscale(float r_elem_disp[3],
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const KelvinletParams *params,
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const float elem_orig_co[3],
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const float brush_location[3],
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const float brush_delta[3]);
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void BKE_kelvinlet_scale(float r_elem_disp[3],
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const KelvinletParams *params,
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const float elem_orig_co[3],
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const float brush_location[3],
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const float surface_normal[3]);
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void BKE_kelvinlet_twist(float r_elem_disp[3],
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const KelvinletParams *params,
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const float elem_orig_co[3],
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const float brush_location[3],
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const float surface_normal[3]);
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#ifdef __cplusplus
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}
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#endif
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#endif
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