public float[,] Process(float[,] sourceElevation, float minimumElevation, float xyScaleToMeters, float zScaleToMeters, float rainWaterAmount, float sedimentCapacity, float gravityConstant, float frictionConstant, float evaporationConstant, float depositionConstant, float dissolvingConstant, float stepDeltaTime, int finalBlurRadius)
{
UnityEngine.Debug.Log("*** Hydraulic Erosion Process ***");
UnityEngine.Debug.Log("Gravity constant = " + gravityConstant + " m/s^2");
UnityEngine.Debug.Log("Rain Water Amount = " + rainWaterAmount + " m^3");
var stopwatch = new Stopwatch();
stopwatch.Start();
var parallelOptions = new ParallelOptions()
{
MaxDegreeOfParallelism = -1
};
m_outputElevationWidth = sourceElevation.GetLength(1);
m_outputElevationHeight = sourceElevation.GetLength(0);
m_outputElevationWidthMask = m_outputElevationWidth - 1;
// remember constants
m_minimumElevation = minimumElevation * zScaleToMeters;
m_xyScaleToMeters = xyScaleToMeters;
m_zScaleToMeters = zScaleToMeters;
m_rainWaterAmount = rainWaterAmount;
m_sedimentCapacity = sedimentCapacity;
m_gravityConstant = gravityConstant;
m_frictionConstant = 1.0f - (frictionConstant * stepDeltaTime);
m_evaporationConstant = 1.0f - (evaporationConstant * stepDeltaTime);
m_depositionConstant = depositionConstant * stepDeltaTime;
m_dissolvingConstant = dissolvingConstant * stepDeltaTime;
m_stepDeltaTime = stepDeltaTime;
// allocate terrain level buffer
m_outputElevation = new float[m_outputElevationHeight, m_outputElevationWidth];
// initialize terrain level buffer
for (var y = 0; y < m_outputElevationHeight; y++)
{
for (var x = 0; x < m_outputElevationWidth; x++)
{
m_outputElevation[y, x] = sourceElevation[y, x] * zScaleToMeters;
}
}
UnityEngine.Debug.Log("Initialize Terrain Level - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// perlin noise for generating the twist buffer
var noise = new SeamlessNoise(50, 256, 1);
// allocate twist buffer
m_twistBuffer = new int[m_outputElevationHeight, m_outputElevationWidth];
// initialize twist buffer
Parallel.For(0, m_outputElevationHeight, parallelOptions, y =>
{
for (var x = 0; x < m_outputElevationWidth; x++)
{
var sample = noise.Perlin(0, 256, x * 128.0f / m_outputElevationWidth, y * 64.0f / m_outputElevationHeight);
m_twistBuffer[y, x] = Mathf.RoundToInt(sample * 31.0f);
}
});
UnityEngine.Debug.Log("Generate Twist Buffer - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// allocate direction vector buffer
m_directionVector = new Vector3[512];
// initialize direction vector buffer
for (int i = 0; i < 512; i++)
{
var angle = i * Mathf.PI * 2.0f / 512.0f;
var x = Mathf.Sin(angle) * m_xyScaleToMeters;
var y = Mathf.Cos(angle) * m_xyScaleToMeters;
m_directionVector[i] = new Vector3(x, 0.0f, y);
}
UnityEngine.Debug.Log("Generate Direction Vectors - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// allocate, initialize, and shuffle random xy field
var randomXYSize = m_outputElevationHeight / 2;
var randomXYSizeSquared = randomXYSize * randomXYSize;
var randomXY = new Vector2Int[randomXYSizeSquared];
for (var y = 0; y < randomXYSize; y++)
{
for (var x = 0; x < randomXYSize; x++)
{
randomXY[y * randomXYSize + x] = new Vector2Int(x, y);
}
}
Random.InitState(100);
for (var i = 0; i < randomXYSizeSquared; i++)
{
int x = Random.Range(i, randomXYSizeSquared);
var tmp = randomXY[i];
randomXY[i] = randomXY[x];
randomXY[x] = tmp;
}
UnityEngine.Debug.Log("Generate Random XY - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// do erosion steps
var snapshotInterval = 2048;
var snapshotSteps = randomXYSizeSquared / snapshotInterval;
for (var step = 0; step < snapshotSteps; step++)
{
// show progress bar
if (EditorUtility.DisplayCancelableProgressBar("Planet Generator", "Making it rain...", (float)step / (snapshotSteps - 1)))
{
return(null);
}
var offset = step * snapshotInterval;
Parallel.For(0, 8, parallelOptions, j =>
{
var dx = randomXYSize * (j % 4);
var dy = randomXYSize * (j / 4);
for (var i = 0; i < snapshotInterval; i++)
{
var x = randomXY[i + offset].x + dx;
var y = randomXY[i + offset].y + dy;
var drop = new Drop(x, y, m_rainWaterAmount, 0.0f, Vector3.zero);
while (drop.Update())
{
}
}
});
}
UnityEngine.Debug.Log("Erosion Steps - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// remove original elevation and remove scale (prep for blur)
var inverseScaleToMeters = 1.0f / m_zScaleToMeters;
for (var y = 0; y < m_outputElevationHeight; y++)
{
for (var x = 0; x < m_outputElevationWidth; x++)
{
var newElevation = Mathf.Max(0.0f, m_outputElevation[y, x] * inverseScaleToMeters);
var delta = newElevation - sourceElevation[y, x];
m_outputElevation[y, x] = Mathf.Min(0.0f, delta);
}
}
UnityEngine.Debug.Log("Convert to Height Deltas - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// pole smoothing
for (var y = 0; y < m_outputElevationHeight; y++)
{
var p1 = m_outputElevationHeight * 0.1f;
var p2 = m_outputElevationHeight * 0.2f;
var p3 = m_outputElevationHeight * 0.8f;
var p4 = m_outputElevationHeight * 0.9f;
var poleMultiplier = Mathf.SmoothStep(0.0f, 1.0f, (y - p1) / (p2 - p1)) * Mathf.SmoothStep(1.0f, 0.0f, (y - p3) / (p4 - p3));
for (var x = 0; x < m_outputElevationWidth; x++)
{
m_outputElevation[y, x] *= poleMultiplier;
}
}
UnityEngine.Debug.Log("Pole Smoothing - " + stopwatch.ElapsedMilliseconds + " milliseconds");
stopwatch.Restart();
// final blur to get rid of the jaggies in the delta heights
var gaussianBlur = new PG_GaussianBlurElevation();
m_outputElevation = gaussianBlur.Process(m_outputElevation, finalBlurRadius, finalBlurRadius);
// put original elevation back in
for (var y = 0; y < m_outputElevationHeight; y++)
{
for (var x = 0; x < m_outputElevationWidth; x++)
{
m_outputElevation[y, x] += sourceElevation[y, x];
}
}
UnityEngine.Debug.Log("Final Blur - " + stopwatch.ElapsedMilliseconds + " milliseconds");
// return the processed buffer
return(m_outputElevation);
}
public void AsyncProcess(byte[] bytes)
{
var progressStepSize = 0.5f / 12.0f;
m_progress += progressStepSize;
// decompress the planet data
using (var memoryStream = new MemoryStream(bytes))
{
using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress, false))
{
var binaryReader = new BinaryReader(gZipStream);
var version = binaryReader.ReadInt32();
if (version != c_versionNumber)
{
m_abort = true;
}
else
{
m_minimumElevation = binaryReader.ReadSingle();
m_waterElevation = binaryReader.ReadSingle();
m_snowElevation = binaryReader.ReadSingle();
var r = binaryReader.ReadSingle();
var g = binaryReader.ReadSingle();
var b = binaryReader.ReadSingle();
m_waterColor = new Color(r, g, b);
r = binaryReader.ReadSingle();
g = binaryReader.ReadSingle();
b = binaryReader.ReadSingle();
m_groundColor = new Color(r, g, b);
r = binaryReader.ReadSingle();
g = binaryReader.ReadSingle();
b = binaryReader.ReadSingle();
m_snowColor = new Color(r, g, b);
var preparedMapWidth = binaryReader.ReadInt32();
var preparedMapHeight = binaryReader.ReadInt32();
m_preparedHeightMap = new float[preparedMapHeight, preparedMapWidth];
for (var y = 0; y < preparedMapHeight; y++)
{
for (var x = 0; x < preparedMapWidth; x++)
{
m_preparedHeightMap[y, x] = binaryReader.ReadSingle();
}
}
m_preparedColorMap = new Color[preparedMapHeight, preparedMapWidth];
for (var y = 0; y < preparedMapHeight; y++)
{
for (var x = 0; x < preparedMapWidth; x++)
{
r = binaryReader.ReadSingle();
g = binaryReader.ReadSingle();
b = binaryReader.ReadSingle();
m_preparedColorMap[y, x] = new Color(r, g, b);
}
}
if (m_planet.IsGasGiant())
{
m_textureMapWidth = c_gasGiantTextureMapWidth;
m_textureMapHeight = c_gasGiantTextureMapHeight;
}
else
{
m_textureMapWidth = c_nonGasGiantTextureMapWidth;
m_textureMapHeight = c_nonGasGiantTextureMapHeight;
m_minimumDifference = binaryReader.ReadSingle();
m_maximumDifference = binaryReader.ReadSingle();
var differenceBufferSize = m_textureMapWidth * m_textureMapHeight;
m_differenceBuffer = new byte[differenceBufferSize];
gZipStream.Read(m_differenceBuffer, 0, differenceBufferSize);
}
}
}
}
// gas giant or not?
if (m_planet.IsGasGiant())
{
// yes - do color bicubic scale
m_progress += progressStepSize;
var bicubicScaleColor = new PG_BicubicScaleColor();
m_albedoMap = bicubicScaleColor.Process(m_preparedColorMap, m_textureMapWidth, m_textureMapHeight);
// do color gaussian blur (this becomes our albedo map)
m_progress += progressStepSize;
var gaussianBlurColor = new PG_GaussianBlurColor();
m_albedoMap = gaussianBlurColor.Process(m_albedoMap, c_xBlurRadiusGasGiant, c_yBlurRadiusGasGiant);
// do elevation bicubic scale
m_progress += progressStepSize;
var bicubicScaleElevation = new PG_BicubicScaleElevation();
m_elevation = bicubicScaleElevation.Process(m_preparedHeightMap, m_textureMapWidth, m_textureMapHeight);
// do elevation gaussian blur
m_progress += progressStepSize;
var gaussianBlurElevation = new PG_GaussianBlurElevation();
m_elevation = gaussianBlurElevation.Process(m_elevation, c_xBlurRadiusGasGiant, c_yBlurRadiusGasGiant);
// build specular map
m_progress += progressStepSize;
m_specularMap = new Color[m_textureMapHeight, m_textureMapWidth];
for (var y = 0; y < m_textureMapHeight; y++)
{
for (var x = 0; x < m_textureMapWidth; x++)
{
var elevation = m_elevation[y, x];
m_specularMap[y, x] = new Color(elevation, elevation, elevation, 0.25f);
}
}
// build water mask map
m_progress += progressStepSize;
m_waterMaskMap = new Color[4, 4];
for (var y = 0; y < 4; y++)
{
for (var x = 0; x < 4; x++)
{
m_waterMaskMap[y, x] = Color.black;
}
}
// build normal map
m_progress += progressStepSize;
m_normalMap = new Color[4, 4];
var defaultNormal = new Color(0.5f, 0.5f, 1.0f);
for (var y = 0; y < 4; y++)
{
for (var x = 0; x < 4; x++)
{
m_normalMap[y, x] = defaultNormal;
}
}
}
else
{
// do elevation bicubic scale
m_progress += progressStepSize;
var bicubicScaleElevation = new PG_BicubicScaleElevation();
m_elevation = bicubicScaleElevation.Process(m_preparedHeightMap, m_textureMapWidth, m_textureMapHeight);
// do craters
m_progress += progressStepSize;
if (m_planet.m_atmosphereDensityId == 0)
{
var craters = new PG_Craters();
m_elevation = craters.Process(m_elevation, m_planet.m_id, 0.1f, m_waterElevation);
}
// factor in elevation difference map
m_progress += progressStepSize;
m_maximumElevation = 0.0f;
var elevationScale = (m_maximumDifference - m_minimumDifference) / 255.0f;
for (var y = 0; y < m_textureMapHeight; y++)
{
for (var x = 0; x < m_textureMapWidth; x++)
{
var difference = m_differenceBuffer[y * m_textureMapWidth + x];
m_elevation[y, x] += (difference * elevationScale) + m_minimumDifference;
m_maximumElevation = Mathf.Max(m_maximumElevation, m_elevation[y, x]);
}
}
// build albedo map
m_progress += progressStepSize;
var albedoMap = new PG_AlbedoMap();
m_albedoMap = albedoMap.Process(m_elevation, m_preparedColorMap, m_waterElevation, m_waterColor, m_groundColor);
// build specular map
m_progress += progressStepSize;
var waterSpecularColor = m_planet.IsMolten() ? new Color(0.75f, 0.125f, 0.125f) : new Color(1.0f, 1.0f, 1.0f);
var waterSpecularPower = m_planet.IsMolten() ? 0.4f : 0.75f;
var specularMap = new PG_SpecularMap();
m_specularMap = specularMap.Process(m_elevation, m_albedoMap, m_waterElevation, waterSpecularColor, waterSpecularPower, 4);
// build water mask map
m_progress += progressStepSize;
var waterMaskMap = new PG_WaterMaskMap();
m_waterMaskMap = waterMaskMap.Process(m_elevation, m_waterElevation, 4);
// build normal map
m_progress += progressStepSize;
var normalMap = new PG_NormalMap();
m_normalMap = normalMap.Process(m_elevation, c_normalScale, m_waterElevation, 2);
}
// get albedo pixels
m_progress += progressStepSize;
m_albedoPixels = new Color[m_textureMapWidth * m_textureMapHeight];
var index = 0;
for (var y = 0; y < m_textureMapHeight; y++)
{
for (var x = 0; x < m_textureMapWidth; x++)
{
m_albedoPixels[index++] = m_albedoMap[y, x];
}
}
// get specular pixels
m_progress += progressStepSize;
var textureMapWidth = m_specularMap.GetLength(1);
var textureMapHeight = m_specularMap.GetLength(0);
m_specularPixels = new Color[textureMapWidth * textureMapHeight];
index = 0;
for (var y = 0; y < textureMapHeight; y++)
{
for (var x = 0; x < textureMapWidth; x++)
{
m_specularPixels[index++] = m_specularMap[y, x];
}
}
// get water mask pixels
m_progress += progressStepSize;
textureMapWidth = m_waterMaskMap.GetLength(1);
textureMapHeight = m_waterMaskMap.GetLength(0);
m_waterMaskPixels = new Color[textureMapWidth * textureMapHeight];
index = 0;
for (var y = 0; y < textureMapHeight; y++)
{
for (var x = 0; x < textureMapWidth; x++)
{
m_waterMaskPixels[index++] = m_waterMaskMap[y, x];
}
}
// get normal pixels
m_progress += progressStepSize;
textureMapWidth = m_normalMap.GetLength(1);
textureMapHeight = m_normalMap.GetLength(0);
m_normalPixels = new Color[textureMapWidth * textureMapHeight];
index = 0;
for (var y = 0; y < textureMapHeight; y++)
{
for (var x = 0; x < textureMapWidth; x++)
{
m_normalPixels[index++] = new Color(0.0f, m_normalMap[y, x].g, 0.0f, m_normalMap[y, x].r);
}
}
m_step = 20;
}
