public void RiverErode()
{
int fn = 10; // furthest neighbor count (how much this affects other pixels)
float scale = 0.001f; // global river erosion factor (heuristic)
bool[,] hit = new bool[xRes, zRes];
float[,] prevH = thisTerrain.terrainData.GetHeights(0, 0, xRes, zRes);
for (int l = waterSpots.Count, i = 0; i < l; i++)
{
WaterSeed ws = waterSpots[i];
if (ws.erosionStrength <= 0)
{
continue; //
}
int basinHitCount = 0;
for (int ll = ws.basinVertices.Count, j = 0; j < ll; j++)
{
int I = 0, J = 0;
terrainUVToPixel(ws.basinVertices[j].uv, ref I, ref J);
if (hit[I, J])
{
continue;
}
hit[I, J] = true;
basinHitCount++;
// Compute neighbour# and strength based on steepness and relative length run
int N = (int)(ws.basinVertices[j].normal.y * fn * (basinHitCount / 10)) + 1; // affect more neighbors if flatter
float strength = ws.erosionStrength * (1 - ws.basinVertices[j].normal.y); // erode less if flatter
// Center
prevH[J, I] -= scale * strength;
for (int u = -N; u <= N; u++)
{
if (I + u < 0 || I + u > xRes)
{
continue; // if outside terrain heightmap pixels
}
for (int v = -N; v <= N; v++)
{
if (J + v < 0 || J + v > zRes)
{
continue; // if outside terrain heightmap pixels
}
prevH[J + v, I + u] -= scale * strength
- scale * strength * Mathf.Clamp01((u * u + v * v) / (N * N)); // note flipped i,j here
}
}
}
ws.erosionStrength -= 0.1f;
}
thisTerrain.terrainData.SetHeights(0, 0, prevH);
}
/******************************
* DEBUG GIZMO DISPLAY
******************************/
void OnDrawGizmos()
{
if (riverGizmos)
{
Gizmos.color = Color.blue;
for (int i = 0; i < waterSpots.Count; i++)
{
WaterSeed ws = waterSpots[i];
for (int j = 0; j < ws.basinVertices.Count; j++)
{
BasinVertex bv = ws.basinVertices[j];
Gizmos.DrawLine(bv.position, bv.position + 10 * bv.normal);
}
}
}
}
// ██╗ ██╗██████╗ ██████╗ █████╗ ████████╗███████╗
// ██║ ██║██╔══██╗██╔══██╗██╔══██╗╚══██╔══╝██╔════╝
// ██║ ██║██████╔╝██║ ██║███████║ ██║ █████╗
// ██║ ██║██╔═══╝ ██║ ██║██╔══██║ ██║ ██╔══╝
// ╚██████╔╝██║ ██████╔╝██║ ██║ ██║ ███████╗
// ╚═════╝ ╚═╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚══════╝
// Update is called once per frame
void Update()
{
// Pre-update state-based vars
frame++;
// KEYBOARD INTERACTION
if (Input.GetKeyDown(KeyCode.G))
{
riverGizmos = !riverGizmos;
}
// Toggle geological time scale on right mouse click
if (Input.GetKeyDown(KeyCode.T))
{
toggleGeoTime();
if (geoTimeScale)
{
storeCurrentPosition();
enableCursor(false);
}
else
{
resetPrevPosition();
enableCursor(true);
}
toggleMainCamera();
}
// Change to Terraform mode
if (Input.GetKeyDown(KeyCode.P))
{
cursorMode = TERRAFORM;
}
// Change to Mountain mode
if (Input.GetKeyDown(KeyCode.M))
{
cursorMode = MOUNTAIN;
}
// Change to Water mode
if (Input.GetKeyDown(KeyCode.F))
{
cursorMode = WATER;
}
// Force Erode
if (Input.GetKey(KeyCode.E))
{
switch (ErosionType)
{
case (ET.steepness):
SteepnessErode();
break;
case (ET.wind):
WindErode();
break;
case (ET.gradientDescent):
GradientErode();
break;
}
}
// Recompute textures on ErodeUP
if (Input.GetKeyUp(KeyCode.E))
{
applyTexture();
}
// MOUSE INTERACTIONS
// Perform human actions if applicable (disabled for geotime mode)
if (humanActions && !geoTimeScale)
{
// Calculate terrain cursor position
RaycastHit hit;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
bool wasHit = Physics.Raycast(ray, out hit);
Vector3 targetPos = new Vector3(hit.point.x, hit.point.y + 5f, hit.point.z);
cursorProjector.transform.position = targetPos;
// MOUSE BUTTON DOWN
if (Input.GetMouseButtonDown(0) || Input.GetMouseButtonDown(1))
{
switch (cursorMode)
{
// set mountain seeds
case MOUNTAIN:
MountainSeed ms = new MountainSeed(this, hit.point, pullRadius);
if (wasHit)
{
mountainSpots.Add(ms);
}
if (debugLogs)
{
Debug.Log(ms.ToString());
}
break;
case WATER:
WaterSeed ws = new WaterSeed(this, hit.point, pullRadius);
if (wasHit)
{
waterSpots.Add(ws);
}
if (debugLogs)
{
Debug.Log(ws.ToString());
}
break;
}
}
// MOUSE BUTTON HELD DOWN
// If any mouse button is pressed, perform actions based on cursorMode
if (Input.GetMouseButton(0) || Input.GetMouseButton(1))
{
switch (cursorMode)
{
// push/pull terrain
case TERRAFORM:
if (wasHit)
{
humanPullTerrain(hit.point, Input.GetMouseButton(0));
}
break;
}
}
// Apply textures on human terraforming mouse up
if (Input.GetMouseButtonUp(0) || Input.GetMouseButtonUp(1))
{
switch (cursorMode)
{
// push/pull terrain
case TERRAFORM:
if (wasHit)
{
//applyTexture();
}
break;
}
}
// If scrollwheel, update pullRadius and cursorProjector
float wheel = Input.GetAxis("Mouse ScrollWheel");
if (wheel != 0)
{
pullRadius *= wheel > 0 ? wheelIncrement : (1 / wheelIncrement);
cursorProjector.orthographicSize = pullRadius;
}
}
// If on geoTimeScale, what to do
if (geoTimeScale)
{
year += 1000;
// Update GUI elements
labelContent.text = "Year " + year.ToString() + "...";
// Call the main function with terrain modifications for this mode
geoTimeTerrainMod();
}
if (Input.GetKeyDown(KeyCode.R))
{
resetTerrain();
}
}
// ██╗ ██╗██████╗ ██████╗ █████╗ ████████╗███████╗
// ██║ ██║██╔══██╗██╔══██╗██╔══██╗╚══██╔══╝██╔════╝
// ██║ ██║██████╔╝██║ ██║███████║ ██║ █████╗
// ██║ ██║██╔═══╝ ██║ ██║██╔══██║ ██║ ██╔══╝
// ╚██████╔╝██║ ██████╔╝██║ ██║ ██║ ███████╗
// ╚═════╝ ╚═╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚══════╝
// Update is called once per frame
void Update()
{
// Pre-update state-based vars
frame++;
// KEYBOARD INTERACTION
if (Input.GetKeyDown (KeyCode.G)) {
riverGizmos = !riverGizmos;
}
// Toggle geological time scale on right mouse click
if (Input.GetKeyDown(KeyCode.T)) {
toggleGeoTime();
if (geoTimeScale) {
storeCurrentPosition();
enableCursor(false);
} else {
resetPrevPosition();
enableCursor(true);
}
toggleMainCamera();
}
// Change to Terraform mode
if (Input.GetKeyDown (KeyCode.P)) {
cursorMode = TERRAFORM;
}
// Change to Mountain mode
if (Input.GetKeyDown (KeyCode.M)) {
cursorMode = MOUNTAIN;
}
// Change to Water mode
if (Input.GetKeyDown (KeyCode.F)) {
cursorMode = WATER;
}
// Force Erode
if (Input.GetKey(KeyCode.E)){
switch(ErosionType) {
case(ET.steepness):
SteepnessErode();
break;
case(ET.wind):
WindErode();
break;
case(ET.gradientDescent):
GradientErode();
break;
}
}
// Recompute textures on ErodeUP
if (Input.GetKeyUp(KeyCode.E)) {
applyTexture ();
}
// MOUSE INTERACTIONS
// Perform human actions if applicable (disabled for geotime mode)
if (humanActions && !geoTimeScale) {
// Calculate terrain cursor position
RaycastHit hit;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
bool wasHit = Physics.Raycast(ray, out hit);
Vector3 targetPos = new Vector3(hit.point.x, hit.point.y + 5f, hit.point.z);
cursorProjector.transform.position = targetPos;
// MOUSE BUTTON DOWN
if (Input.GetMouseButtonDown(0) || Input.GetMouseButtonDown(1)) {
switch(cursorMode) {
// set mountain seeds
case MOUNTAIN:
MountainSeed ms = new MountainSeed(this, hit.point, pullRadius);
if (wasHit) mountainSpots.Add(ms);
if (debugLogs) Debug.Log(ms.ToString());
break;
case WATER:
WaterSeed ws = new WaterSeed(this, hit.point, pullRadius);
if (wasHit) waterSpots.Add(ws);
if (debugLogs) Debug.Log(ws.ToString());
break;
}
}
// MOUSE BUTTON HELD DOWN
// If any mouse button is pressed, perform actions based on cursorMode
if (Input.GetMouseButton(0) || Input.GetMouseButton (1)) {
switch(cursorMode) {
// push/pull terrain
case TERRAFORM:
if(wasHit) {
humanPullTerrain(hit.point, Input.GetMouseButton(0));
}
break;
}
}
// Apply textures on human terraforming mouse up
if (Input.GetMouseButtonUp(0) || Input.GetMouseButtonUp (1)) {
switch(cursorMode) {
// push/pull terrain
case TERRAFORM:
if(wasHit) {
//applyTexture();
}
break;
}
}
// If scrollwheel, update pullRadius and cursorProjector
float wheel = Input.GetAxis("Mouse ScrollWheel");
if (wheel != 0) {
pullRadius *= wheel > 0 ? wheelIncrement : ( 1/ wheelIncrement);
cursorProjector.orthographicSize = pullRadius;
}
}
// If on geoTimeScale, what to do
if (geoTimeScale) {
year += 1000;
// Update GUI elements
labelContent.text = "Year " + year.ToString() + "...";
// Call the main function with terrain modifications for this mode
geoTimeTerrainMod();
}
if (Input.GetKeyDown (KeyCode.R)) {
resetTerrain();
}
}
