Reorganize source files into logical subdirectories

Co-authored-by: Hirek193 <23196899+Hirek193@users.noreply.github.com>

world/Spring.cpp

@@ -0,0 +1,51 @@
+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#include "stdafx.h"
+#include "Spring.h"
+
+void TSpring::Init(double nKs, double nKd) {
+    Ks = nKs;
+    Kd = nKd;
+    ks = Ks;
+    kd = Kd;
+}
+
+Math3D::vector3 TSpring::ComputateForces( Math3D::vector3 const &pPosition1, Math3D::vector3 const &pPosition2) {
+
+    Math3D::vector3 springForce;
+    //		p1 = &system[spring->p1];
+    //		p2 = &system[spring->p2];
+    //		VectorDifference(&p1->pos,&p2->pos,&deltaP);	// Vector distance
+    auto deltaP = pPosition1 - pPosition2;
+    //		dist = VectorLength(&deltaP);					// Magnitude of deltaP
+    auto dist = deltaP.Length();
+    if( dist > restLen ) {
+
+        //		Hterm = (dist - spring->restLen) * spring->Ks;	// Ks * (dist - rest)
+        auto Hterm = ( dist - restLen ) * Ks; // Ks * (dist - rest)
+
+        //		VectorDifference(&p1->v,&p2->v,&deltaV);		// Delta Velocity Vector
+        auto deltaV = pPosition1 - pPosition2;
+
+        //		Dterm = (DotProduct(&deltaV,&deltaP) * spring->Kd) / dist; // Damping Term
+        auto Dterm = (DotProduct(deltaV,deltaP) * Kd) / dist;
+        //Dterm = 0;
+
+        //		ScaleVector(&deltaP,1.0f / dist, &springForce);	// Normalize Distance Vector
+        //		ScaleVector(&springForce,-(Hterm + Dterm),&springForce);	// Calc Force
+        springForce = deltaP / dist * ( -( Hterm + Dterm ));
+        //		VectorSum(&p1->f,&springForce,&p1->f);			// Apply to Particle 1
+        //		VectorDifference(&p2->f,&springForce,&p2->f);	// - Force on Particle 2
+    }
+
+    return springForce;
+}
+
+//---------------------------------------------------------------------------