private void PropagateWaves()
{
var leftDelta = new float[_nodes.Length];
var rightDelta = new float[_nodes.Length];
const int iterations = 2;
for (var j = 0; j < iterations; j++)
{
//Propagate Outward from each node
for (var i = 0; i < _nodes.Length; i++)
{
Water2DSurfaceNodeData leftNode = null;
Water2DSurfaceNodeData node = _nodes[i];
Water2DSurfaceNodeData rightNode = null;
if (i + 1 < _nodes.Length)
{
rightNode = _nodes[i + 1];
}
if (i - 1 >= 0)
{
leftNode = _nodes[i - 1];
}
//Multiply height difference by a spread factor
if (leftNode != null)
{
leftDelta[i] = spread * (node.yPos - leftNode.yPos);
leftNode.velocity += leftDelta[i];
}
if (rightNode != null)
{
rightDelta[i] = spread * (node.yPos - rightNode.yPos);
rightNode.velocity += rightDelta[i];
}
}
}
//Finally Update Positions
for (var i = 0; i < _nodes.Length; i++)
{
//Left
if (i - 1 >= 0)
{
_nodes[i - 1].yPos += leftDelta[i];
}
//Right
if (i + 1 < _nodes.Length)
{
_nodes[i + 1].yPos += rightDelta[i];
}
}
}
private void SpawnWater()
{
_edgeCount = Mathf.RoundToInt(width) * nodeDensity;
var nodeCount = _edgeCount + 1;
var meshWidth = width / _edgeCount;
_nodes = new Water2DSurfaceNodeData[nodeCount];
_meshes = new Water2DMeshData[_edgeCount];
//Build Nodes
for (var i = 0; i < _nodes.Length; i++)
{
var node = new Water2DSurfaceNodeData();
_nodes[i] = node;
node.yPos = Top;
node.xPos = Left + (width * i) / _edgeCount;
node.acceleration = 0;
node.velocity = 0;
}
//Build Meshes
for (var i = 0; i < _meshes.Length; i++)
{
var leftNode = _nodes[i];
var rightNode = _nodes[i + 1];
_meshes[i] = new Water2DMeshData();
var edgeMesh = _meshes[i];
//Build Mesh
edgeMesh.mesh = new Mesh();
Vector3[] verts = new Vector3[4];
verts[0] = new Vector3(0, leftNode.yPos, zOffset);
verts[1] = new Vector3(meshWidth, rightNode.yPos, zOffset);
verts[2] = new Vector3(meshWidth, -height, zOffset);
verts[3] = new Vector3(0, -height, zOffset);
// (0) (1)
// +--------+
// | |
// +--------+
// (3) (2)
Vector2[] uv = new Vector2[4];
uv[0] = new Vector2(0, 1);
uv[1] = new Vector2(1, 1);
uv[2] = new Vector2(0, 0);
uv[3] = new Vector3(1, 0);
int[] triangles = { 0, 1, 3, 3, 1, 2 };
edgeMesh.mesh.vertices = verts;
edgeMesh.mesh.uv = uv;
edgeMesh.mesh.triangles = triangles;
//Build Game Object
edgeMesh.gameObject = new GameObject("Mesh " + i);
edgeMesh.gameObject.transform.parent = transform;
edgeMesh.gameObject.transform.localPosition = new Vector3(leftNode.xPos, 0, 0);
edgeMesh.renderer = edgeMesh.gameObject.AddComponent <MeshRenderer>();
edgeMesh.filter = edgeMesh.gameObject.AddComponent <MeshFilter>();
edgeMesh.renderer.material = material;
edgeMesh.filter.mesh = edgeMesh.mesh;
//Build Collider
if (useCollider3D)
{
edgeMesh.collider3D = edgeMesh.gameObject.AddComponent <BoxCollider>();
edgeMesh.collider3D.size = new Vector3(meshWidth, height, 1);
edgeMesh.collider3D.center = new Vector3(meshWidth * 0.5f, height * -0.5f, 0.5f);
edgeMesh.collider3D.isTrigger = true; //*/
var waterCollider = edgeMesh.collider3D.gameObject.AddComponent <Water3DCollider>();
waterCollider.WaterBody = this;
waterCollider.LeftNode = i;
waterCollider.RightNode = i + 1;
}
else
{
edgeMesh.collider = edgeMesh.gameObject.AddComponent <BoxCollider2D>();
edgeMesh.collider.size = new Vector2(meshWidth, height);
edgeMesh.collider.offset = new Vector2(meshWidth * 0.5f, height * -0.5f);
edgeMesh.collider.isTrigger = true;
var waterCollider = edgeMesh.collider.gameObject.AddComponent <Water2DCollider>();
waterCollider.WaterBody = this;
waterCollider.LeftNode = i;
waterCollider.RightNode = i + 1;
}
}
}