public static SoftBody CreateRope(SoftBodyWorldInfo worldInfo, Vector3 from,
Vector3 to, int resolution, int fixedTips)
{
// Create nodes
int numLinks = resolution + 2;
var positions = new Vector3[numLinks];
var masses = new double[numLinks];
for (int i = 0; i < numLinks; i++)
{
Vector3.Lerp(ref from, ref to, i / (double)(numLinks - 1), out positions[i]);
masses[i] = 1;
}
var body = new SoftBody(worldInfo, numLinks, positions, masses);
if ((fixedTips & 1) != 0)
{
body.SetMass(0, 0);
}
if ((fixedTips & 2) != 0)
{
body.SetMass(numLinks - 1, 0);
}
// Create links
for (int i = 1; i < numLinks; i++)
{
body.AppendLink(i - 1, i);
}
return(body);
}
public static SoftBody CreateRope(SoftBodyWorldInfo worldInfo, Vector3 from,
Vector3 to, int res, int fixeds)
{
// Create nodes
int r = res + 2;
Vector3[] x = new Vector3[r];
float[] m = new float[r];
for (int i = 0; i < r; i++)
{
Vector3.Lerp(ref from, ref to, i / (float)(r - 1), out x[i]);
m[i] = 1;
}
SoftBody psb = new SoftBody(worldInfo, r, x, m);
if ((fixeds & 1) != 0)
{
psb.SetMass(0, 0);
}
if ((fixeds & 2) != 0)
{
psb.SetMass(r - 1, 0);
}
// Create links
for (int i = 1; i < r; i++)
{
psb.AppendLink(i - 1, i);
}
return(psb);
}
void InitSticks()
{
const int n = 16;
const int sg = 4;
const float sz = 5;
const float hg = 4;
const float inf = 1 / (float)(n - 1);
for (int y = 0; y < n; ++y)
{
for (int x = 0; x < n; ++x)
{
Vector3 org = new Vector3(-sz + sz * 2 * x * inf,
-10, -sz + sz * 2 * y * inf);
SoftBody psb = SoftBodyHelpers.CreateRope(softBodyWorldInfo, org,
org + new Vector3(hg * 0.001f, hg, 0), sg, 1);
psb.Cfg.DP = 0.005f;
psb.Cfg.Chr = 0.1f;
for (int i = 0; i < 3; ++i)
{
psb.GenerateBendingConstraints(2 + i);
}
psb.SetMass(1, 0);
psb.SetTotalMass(0.01f);
SoftWorld.AddSoftBody(psb);
}
}
CreateBigBall(new Vector3(0, 13, 0));
}
internal override bool _BuildCollisionObject()
{
if (meshSettings.numPointsInRope < 2)
{
Debug.LogError("There must be at least two points in the rope");
return(false);
}
if (SoftBodySettings.totalMass <= 0f)
{
Debug.LogError("The rope must have a positive mass");
return(false);
}
SoftBody m_BSoftBody = SoftBodyHelpers.CreateRope(World.WorldInfo,
meshSettings.startPoint.ToBullet(), meshSettings.endPoint.ToBullet(), meshSettings.numPointsInRope, 0);
m_collisionObject = m_BSoftBody;
verts = new Vector3[m_BSoftBody.Nodes.Count];
norms = new Vector3[m_BSoftBody.Nodes.Count];
for (int i = 0; i < m_BSoftBody.Nodes.Count; i++)
{
verts[i] = m_BSoftBody.Nodes[i].Position.ToUnity();
norms[i] = m_BSoftBody.Nodes[i].Normal.ToUnity();
}
//Set SB settings
SoftBodySettings.ConfigureSoftBody(m_BSoftBody);
foreach (RopeAnchor anchor in ropeAnchors)
{
//anchorNode point 0 to 1, rounds to node #
int node = (int)Mathf.Floor(Mathf.Lerp(0, m_BSoftBody.Nodes.Count - 1, anchor.anchorNodePoint));
if (anchor.body != null)
{
m_BSoftBody.AppendAnchor(node, (BulletSharp.RigidBody)anchor.body.GetCollisionObject());
}
else
{
m_BSoftBody.SetMass(node, 0); //setting node mass to 0 fixes it in space apparently
}
}
//TODO: lr, Doesnt always work in editor
LineRenderer lr = GetComponent <LineRenderer>();
lr.useWorldSpace = false;
lr.SetVertexCount(verts.Length);
lr.SetWidth(meshSettings.width, meshSettings.width);
lr.SetColors(meshSettings.startColor, meshSettings.endColor);
//Set SB position to GO position
//m_BSoftBody.Rotate(transform.rotation.ToBullet());
//m_BSoftBody.Translate(transform.position.ToBullet());
//m_BSoftBody.Scale(transform.localScale.ToBullet());
UpdateMesh();
return(true);
}
public static SoftBody CreatePatch(SoftBodyWorldInfo worldInfo, Vector3 corner00,
Vector3 corner10, Vector3 corner01, Vector3 corner11, int resolutionX, int resolutionY,
int fixedCorners, bool generateDiagonals)
{
// Create nodes
if ((resolutionX < 2) || (resolutionY < 2))
{
return(null);
}
int rx = resolutionX;
int ry = resolutionY;
int total = rx * ry;
var positions = new Vector3[total];
var masses = new double[total];
for (int y = 0; y < ry; y++)
{
double ty = y / (double)(ry - 1);
Vector3 py0, py1;
Vector3.Lerp(ref corner00, ref corner01, ty, out py0);
Vector3.Lerp(ref corner10, ref corner11, ty, out py1);
for (int ix = 0; ix < rx; ix++)
{
double tx = ix / (double)(rx - 1);
int index = rx * y + ix;
Vector3.Lerp(ref py0, ref py1, tx, out positions[index]);
masses[index] = 1;
}
}
var body = new SoftBody(worldInfo, total, positions, masses);
if ((fixedCorners & 1) != 0)
{
body.SetMass(0, 0);
}
if ((fixedCorners & 2) != 0)
{
body.SetMass(rx - 1, 0);
}
if ((fixedCorners & 4) != 0)
{
body.SetMass(rx * (ry - 1), 0);
}
if ((fixedCorners & 8) != 0)
{
body.SetMass(rx * (ry - 1) + rx - 1, 0);
}
// Create links and faces
for (int y = 0; y < ry; ++y)
{
for (int x = 0; x < rx; ++x)
{
int ixy = rx * y + x;
int ix1y = ixy + 1;
int ixy1 = rx * (y + 1) + x;
bool mdx = (x + 1) < rx;
bool mdy = (y + 1) < ry;
if (mdx)
{
body.AppendLink(ixy, ix1y);
}
if (mdy)
{
body.AppendLink(ixy, ixy1);
}
if (mdx && mdy)
{
int ix1y1 = ixy1 + 1;
if (((x + y) & 1) != 0)
{
body.AppendFace(ixy, ix1y, ix1y1);
body.AppendFace(ixy, ix1y1, ixy1);
if (generateDiagonals)
{
body.AppendLink(ixy, ix1y1);
}
}
else
{
body.AppendFace(ixy1, ixy, ix1y);
body.AppendFace(ixy1, ix1y, ix1y1);
if (generateDiagonals)
{
body.AppendLink(ix1y, ixy1);
}
}
}
}
}
return(body);
}
public static SoftBody CreatePatch(SoftBodyWorldInfo worldInfo, Vector3 corner00,
Vector3 corner10, Vector3 corner01, Vector3 corner11, int resx, int resy,
int fixeds, bool gendiags)
{
// Create nodes
if ((resx < 2) || (resy < 2))
{
return(null);
}
int rx = resx;
int ry = resy;
int tot = rx * ry;
Vector3[] x = new Vector3[tot];
float[] m = new float[tot];
for (int iy = 0; iy < ry; iy++)
{
float ty = iy / (float)(ry - 1);
Vector3 py0, py1;
Vector3.Lerp(ref corner00, ref corner01, ty, out py0);
Vector3.Lerp(ref corner10, ref corner11, ty, out py1);
for (int ix = 0; ix < rx; ix++)
{
float tx = ix / (float)(rx - 1);
int index = rx * iy + ix;
Vector3.Lerp(ref py0, ref py1, tx, out x[index]);
m[index] = 1;
}
}
SoftBody psb = new SoftBody(worldInfo, tot, x, m);
if ((fixeds & 1) != 0)
{
psb.SetMass(0, 0);
}
if ((fixeds & 2) != 0)
{
psb.SetMass(rx - 1, 0);
}
if ((fixeds & 4) != 0)
{
psb.SetMass(rx * (ry - 1), 0);
}
if ((fixeds & 8) != 0)
{
psb.SetMass(rx * (ry - 1) + rx - 1, 0);
}
// Create links and faces
for (int iy = 0; iy < ry; ++iy)
{
for (int ix = 0; ix < rx; ++ix)
{
int ixy = rx * iy + ix;
int ix1y = ixy + 1;
int ixy1 = rx * (iy + 1) + ix;
bool mdx = (ix + 1) < rx;
bool mdy = (iy + 1) < ry;
if (mdx)
{
psb.AppendLink(ixy, ix1y);
}
if (mdy)
{
psb.AppendLink(ixy, ixy1);
}
if (mdx && mdy)
{
int ix1y1 = ixy1 + 1;
if (((ix + iy) & 1) != 0)
{
psb.AppendFace(ixy, ix1y, ix1y1);
psb.AppendFace(ixy, ix1y1, ixy1);
if (gendiags)
{
psb.AppendLink(ixy, ix1y1);
}
}
else
{
psb.AppendFace(ixy1, ixy, ix1y);
psb.AppendFace(ixy1, ix1y, ix1y1);
if (gendiags)
{
psb.AppendLink(ix1y, ixy1);
}
}
}
}
}
return(psb);
}
// Create a sequence of flag objects and add them to the world.
void CreateFlag(int width, int height, out AlignedSoftBodyArray flags)
{
flags = new AlignedSoftBodyArray();
// First create a triangle mesh to represent a flag
// Allocate a simple mesh consisting of a vertex array and a triangle index array
IndexedMesh mesh = new IndexedMesh();
mesh.NumVertices = width * height;
mesh.NumTriangles = 2 * (width - 1) * (height - 1);
Vector3Array vertexArray = new Vector3Array(mesh.NumVertices);
mesh.Vertices = vertexArray;
mesh.VertexStride = Vector3.SizeInBytes;
IntArray triangleVertexIndexArray = new IntArray(3 * mesh.NumTriangles);
mesh.TriangleIndices = triangleVertexIndexArray;
mesh.TriangleIndexStride = sizeof(int) * 3;
// Generate normalised object space vertex coordinates for a rectangular flag
Matrix defaultScale = Matrix.Scaling(5, 20, 1);
for (int y = 0; y < height; ++y)
{
float yCoordinate = y * 2.0f / (float)height - 1.0f;
for (int x = 0; x < width; ++x)
{
float xCoordinate = x * 2.0f / (float)width - 1.0f;
Vector3 vertex = new Vector3(xCoordinate, yCoordinate, 0.0f);
vertexArray[y * width + x] = Vector3.TransformCoordinate(vertex, defaultScale);
}
}
// Generate vertex indices for triangles
for (int y = 0; y < (height - 1); ++y)
{
for (int x = 0; x < (width - 1); ++x)
{
// Triangle 0
// Top left of square on mesh
{
int vertex0 = y * width + x;
int vertex1 = vertex0 + 1;
int vertex2 = vertex0 + width;
int triangleIndex = 2 * (y * (width - 1) + x);
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int)] = vertex0;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex + 1) / sizeof(int) + 1] = vertex1;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex + 2) / sizeof(int) + 2] = vertex2;
}
// Triangle 1
// Bottom right of square on mesh
{
int vertex0 = y * width + x + 1;
int vertex1 = vertex0 + width;
int vertex2 = vertex1 - 1;
int triangleIndex = 2 * y * (width - 1) + 2 * x + 1;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int)] = vertex0;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int) + 1] = vertex1;
triangleVertexIndexArray[(mesh.TriangleIndexStride * triangleIndex) / sizeof(int) + 2] = vertex2;
}
}
}
Matrix defaultRotateAndScale = Matrix.RotationX(0.5f);
// Construct the sequence flags applying a slightly different translation to each one to arrange them
// appropriately in the scene.
for (int i = 0; i < numFlags; ++i)
{
float zTranslate = flagSpacing * (i - numFlags / 2);
Vector3 defaultTranslate = new Vector3(0, 20, zTranslate);
Matrix transform = defaultRotateAndScale * Matrix.Translation(defaultTranslate);
SoftBody softBody = CreateFromIndexedMesh(vertexArray, triangleVertexIndexArray, true);
for (int j = 0; j < mesh.NumVertices; ++j)
{
softBody.SetMass(j, 10.0f / mesh.NumVertices);
}
softBody.SetMass((height - 1) * width, 0);
softBody.SetMass((height - 1) * width + width - 1, 0);
softBody.SetMass((height - 1) * width + width / 2, 0);
softBody.Cfg.Collisions = FCollisions.CLSS | FCollisions.CLRS;
softBody.Cfg.LF = 0.0005f;
softBody.Cfg.VCF = 0.001f;
softBody.Cfg.DP = 0.0f;
softBody.Cfg.DG = 0.0f;
flags.Add(softBody);
softBody.Transform(transform);
SoftWorld.AddSoftBody(softBody);
}
//delete [] vertexArray;
//delete [] triangleVertexIndexArray;
}
private void OnSceneGUI()
{
if (!EditorApplication.isPlaying)
{
Handles.BeginGUI();
GUILayout.Label("Viewing nodes only supported while playing.");
Handles.EndGUI();
return;
}
SoftBody softBody = bSoftBodyTarget.GetCollisionObject() as SoftBody;
if (softBody == null)
{
Handles.BeginGUI();
GUILayout.Label("Seems like the CollisionObject has not been generated.");
Handles.EndGUI();
return;
}
bool clickedNode = false;
AlignedNodeArray nodes = softBody.Nodes;
float highestMass = 0;
for (int i = 0; i < nodes.Count; i++)
{
float invMass = nodes[i].InverseMass;
if (invMass > 0 && 1 / invMass > highestMass)
{
highestMass = 1 / invMass;
}
}
for (int i = 0; i < nodes.Count; i++)
{
float mass = softBody.GetMass(i);
if (_currentSelectedNode == i)
{
Handles.BeginGUI();
EditorGUI.BeginChangeCheck();
EditorGUILayout.LabelField(string.Format("id: {0}", i));
mass = EditorGUILayout.Slider("Mass", mass, 0, Mathf.Clamp(mass * 10, 1, 100), GUILayout.Width(500));
if (EditorGUI.EndChangeCheck())
{
softBody.SetMass(i, mass);
nodes[i].Velocity = BulletSharp.Math.Vector3.Zero;
nodes[i].Force = BulletSharp.Math.Vector3.Zero;
}
Handles.EndGUI();
Handles.color = Color.green;
}
else
{
Color usedColor;
if (mass > 0)
{
usedColor = Color.Lerp(Color.white, Color.gray, mass / highestMass);
}
else
{
usedColor = Color.blue;
}
Handles.color = usedColor;
}
Vector3 position = nodes[i].Position.ToUnity();
float size = HandleUtility.GetHandleSize(position) * 0.5f;
if (Handles.Button(position, Quaternion.identity, size, size, Handles.SphereHandleCap))
{
clickedNode = true;
_currentSelectedNode = i;
}
}
if (!clickedNode && Input.GetMouseButton(0))
{
_currentSelectedNode = -1;
}
}