/// <summary>
/// Initializes a new instance of the <see cref="DynamicWaterMesh"/> class.
/// </summary>
/// <param name="resolution">
/// The number of grid nodes along the bigger side of the mesh.
/// </param>
/// <param name="size">The width and length of the mesh</param>
/// <param name="settings">
/// DynamicWaterSettings instance representing the public settings properties of <see cref="DynamicWater"/> class.
/// </param>
/// <param name="fieldObstruction">
/// The array of <c>byte</c> indicating whether the water is obstructed by an object. \n
/// <c>0</c> means the grid node is obstructed by an object, so the simulation is not updated;
/// <c>255</c> means the grid node is not obstructed, and the simulation can proceed freely.
/// Intermediate values represent the additional dampening value in that node.
/// </param>
public DynamicWaterMesh(int resolution,
Vector2 size,
IDynamicWaterSettings settings,
byte[] fieldObstruction = null)
{
IsReady = false;
_settings = settings;
_size = size;
GridMath.CalculateGrid(resolution, size, out _grid, out _nodeSize);
// Some failsafe
if (_size.x < Vector3.kEpsilon || _size.y < Vector3.kEpsilon) {
_grid = new Vector2Int(1, 1);
}
_mesh = new Mesh();
_mesh.name = "DynamicWaterMesh";
#if !UNITY_3_5
_mesh.MarkDynamic();
#endif
AllocateMeshArrays();
CreateMeshGrid(fieldObstruction);
AssignMesh();
_mesh.RecalculateBounds();
IsReady = true;
}
/// <summary>
/// The initialization method. Automatically called by <see cref="DynamicWater"/>.
/// </summary>
/// <param name="gridSize">
/// Simulation grid resolution.
/// </param>
/// <seealso cref="DynamicWater"/>
public override void Initialize(Vector2Int gridSize) {
base.Initialize(gridSize);
FieldSim = new float[_grid.x * _grid.y];
FieldSimNew = new float[_grid.x * _grid.y];
FieldSimSpeed = new float[_grid.x * _grid.y];
// Initial state
Field = FieldSim;
}
/// <summary>
/// The initialization method. Called by <see cref="DynamicWater"/>.
/// </summary>
/// <param name="gridSize">
/// The simulation grid resolution.
/// </param>
/// <seealso cref="DynamicWater"/>
public override void Initialize(Vector2Int gridSize) {
base.Initialize(gridSize);
_fieldSum = new float[_grid.x * _grid.y];
// Initial state
_field = _fieldSum;
_canInteract = !OnlyAmbient;
}
/// <summary>
/// Performs the wave simulation step.
/// </summary>
/// <param name="field">
/// Represents the current simulation state.
/// </param>
/// <param name="fieldNew">
/// Represents the updated simulation state.
/// </param>
/// <param name="fieldSpeed">
/// Represents the simulation state difference.
/// </param>
/// <param name="fieldObstruction">
/// Array of <c>bool</c> indicating whether the water is obstructed by an object. \n
/// <c>true</c> means the grid node is obstructed by an object, so the simulation is not updated;
/// <c>false</c> means the grid node is not obstructed, and the simulation can proceed freely.
/// </param>
/// <param name="gridSize">
/// Actual simulation grid resolution.
/// </param>
/// <param name="timeDelta">
/// Time delta in seconds.
/// </param>
/// <param name="damping">
/// Damping value. Must be clamped to the 0-1 range.
/// </param>
/// <param name="maxValue">
/// Value representing maximal absolute wave height.
/// </param>
public static void Solve(float[] field, float[] fieldNew, float[] fieldSpeed,
byte[] fieldObstruction, Vector2Int gridSize, float timeDelta, float damping,
out float maxValue)
{
maxValue = float.NegativeInfinity;
bool isFieldObstructionNull = fieldObstruction == null;
float obstructionValue = 1f;
for (int j = 0; j < gridSize.y; j++) {
int index = j * gridSize.x;
for (int i = 0; i < gridSize.x; i++) {
// Not updating borders and obstructions
if (!(i <= 0 || j <= 0 || i >= gridSize.x - 1 || j >= gridSize.y - 1 || (!isFieldObstructionNull && fieldObstruction[index] == byte.MinValue))) {
// Obstruction value (0-1) determined by obstruction geometry and obstruction mask
if (!isFieldObstructionNull) {
obstructionValue = fieldObstruction[index] * FastFunctions.InvertedByteMaxValue;
}
float laplasian = (field[index - 1] +
field[index + 1] +
field[index + gridSize.x] +
field[index - gridSize.x]) * 0.25f -
field[index];
fieldSpeed[index] += laplasian * timeDelta;
fieldNew[index] = (field[index] + fieldSpeed[index]) * damping * obstructionValue;
float valueAbs;
if (fieldNew[index] > 0f) {
valueAbs = fieldNew[index];
} else {
valueAbs = -fieldNew[index];
}
if (valueAbs > maxValue) {
maxValue = valueAbs;
}
}
index++;
}
}
}
public static void CalculateGrid(int resolution, Vector2 size, out Vector2Int grid, out float nodeSize) {
nodeSize = Mathf.Max(size.x, size.y) / resolution;
grid.x = Mathf.FloorToInt(size.x / nodeSize + 1);
grid.y = Mathf.FloorToInt(size.y / nodeSize + 1);
}
/// <summary>
/// The initialization method. Automatically called by <see cref="DynamicWater"/>.
/// </summary>
/// <param name="gridSize">
/// The size in nodes of simulation grid.
/// </param>
/// <seealso cref="DynamicWater"/>
public virtual void Initialize(Vector2Int gridSize) {
_isInitialized = true;
_grid = gridSize;
}
private void CreateSplashLine(Vector2Int start, Vector2Int end, float radius, float force) {
int dx = Math.Abs(end.x - start.x);
int dy = Math.Abs(end.y - start.y);
int sx, sy;
if (start.x < end.x) {
sx = 1;
} else {
sx = -1;
}
if (start.y < end.y) {
sy = 1;
} else {
sy = -1;
}
int err = dx - dy;
bool splashMade = false;
while (true) {
if (start.x == end.x && start.y == end.y) {
break;
}
Vector2 startf;
startf.x = start.x;
startf.y = start.y;
CreateSplashNormalized(startf, radius, force);
splashMade = true;
int e2 = 2 * err;
if (e2 > -dy) {
err = err - dy;
start.x = start.x + sx;
}
if (e2 < dx) {
err = err + dx;
start.y = start.y + sy;
}
}
// Make sure we have made at least one splash
if (!splashMade) {
CreateSplashNormalized(new Vector2(start.x, start.y), radius, force);
}
}
