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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 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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