66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/* SPDX-FileCopyrightText: Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bke
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*/
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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 radius_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 radius_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 radius_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 radius_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 radius_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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