125 lines
3.0 KiB
C++
125 lines
3.0 KiB
C++
/*
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* Copyright (c) 2016-2019 Irlan Robson https://irlanrobson.github.io
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include <testbed/framework/softbody_dragger.h>
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b3SoftBodyDragger::b3SoftBodyDragger(b3Ray3* ray, b3SoftBody* body)
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{
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m_ray = ray;
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m_body = body;
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m_isDragging = false;
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}
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b3SoftBodyDragger::~b3SoftBodyDragger()
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{
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}
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bool b3SoftBodyDragger::StartDragging()
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{
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B3_ASSERT(IsDragging() == false);
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b3SoftBodyRayCastSingleOutput rayOut;
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if (m_body->RayCastSingle(&rayOut, m_ray->A(), m_ray->B()) == false)
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{
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return false;
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}
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m_isDragging = true;
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m_x = rayOut.fraction;
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const b3SoftBodyMesh* mesh = m_body->GetMesh();
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const b3SoftBodyMeshTriangle* triangle = mesh->triangles + rayOut.triangle;
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m_n1 = m_body->GetNode(triangle->v1);
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m_n2 = m_body->GetNode(triangle->v2);
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m_n3 = m_body->GetNode(triangle->v3);
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b3Vec3 v1 = m_n1->GetPosition();
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b3Vec3 v2 = m_n2->GetPosition();
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b3Vec3 v3 = m_n3->GetPosition();
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b3Vec3 B = GetPointB();
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scalar wABC[4];
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b3BarycentricCoordinates(wABC, v1, v2, v3, B);
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if (wABC[3] > B3_EPSILON)
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{
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m_tu = wABC[0] / wABC[3];
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m_tv = wABC[1] / wABC[3];
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m_tw = wABC[2] / wABC[3];
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}
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else
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{
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m_tu = m_tv = m_tw = 0.0f;
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}
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m_t1 = m_n1->GetType();
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m_n1->SetType(e_staticSoftBodyNode);
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m_t2 = m_n2->GetType();
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m_n2->SetType(e_staticSoftBodyNode);
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m_t3 = m_n3->GetType();
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m_n3->SetType(e_staticSoftBodyNode);
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return true;
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}
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void b3SoftBodyDragger::Drag()
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{
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B3_ASSERT(IsDragging() == true);
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b3Vec3 A = GetPointA();
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b3Vec3 B = GetPointB();
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b3Vec3 dx = B - A;
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m_n1->ApplyTranslation(dx);
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m_n2->ApplyTranslation(dx);
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m_n3->ApplyTranslation(dx);
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}
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void b3SoftBodyDragger::StopDragging()
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{
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B3_ASSERT(IsDragging() == true);
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m_n1->SetType(m_t1);
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m_n2->SetType(m_t2);
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m_n3->SetType(m_t3);
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m_isDragging = false;
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}
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b3Vec3 b3SoftBodyDragger::GetPointA() const
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{
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B3_ASSERT(IsDragging() == true);
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b3Vec3 A = m_n1->GetPosition() + m_n1->GetTranslation();
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b3Vec3 B = m_n2->GetPosition() + m_n2->GetTranslation();
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b3Vec3 C = m_n3->GetPosition() + m_n3->GetTranslation();
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return m_tu * A + m_tv * B + m_tw * C;
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}
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b3Vec3 b3SoftBodyDragger::GetPointB() const
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{
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B3_ASSERT(IsDragging() == true);
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return (1.0f - m_x) * m_ray->A() + m_x * m_ray->B();
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} |