/// <summary>
/// Calculates how much ground should go in sediment flow aka force-based erosion
/// Transfers m_terrainField to m_sedimentField basing on
/// m_waterVelocity, m_sedimentCapacity, m_dissolvingConstant,
/// m_depositionConstant, m_tiltAngle, m_minTiltAngle
/// Also calculates m_tiltAngle
/// </summary>
private void DissolveAndDeposition(DoubleDataTexture terrainField, Vector4 dissolvingConstant, float minTiltAngle, int TERRAIN_LAYERS)
{
link.m_tiltAngleMat.SetFloat("_TexSize", size);
link.m_tiltAngleMat.SetFloat("_Layers", TERRAIN_LAYERS);
link.m_tiltAngleMat.SetTexture("_TerrainField", terrainField.READ);
Graphics.Blit(null, tiltAngle, link.m_tiltAngleMat);
link.dissolutionAndDepositionMat.SetTexture("_TerrainField", terrainField.READ);
link.dissolutionAndDepositionMat.SetTexture("_SedimentField", sedimentField.READ);
link.dissolutionAndDepositionMat.SetTexture("_VelocityField", velocity.READ);
link.dissolutionAndDepositionMat.SetTexture("_WaterField", main.READ);
link.dissolutionAndDepositionMat.SetTexture("_TiltAngle", tiltAngle);
link.dissolutionAndDepositionMat.SetFloat("_MinTiltAngle", minTiltAngle);
link.dissolutionAndDepositionMat.SetFloat("_SedimentCapacity", sedimentCapacity);
link.dissolutionAndDepositionMat.SetVector("_DissolvingConstant", dissolvingConstant);
link.dissolutionAndDepositionMat.SetFloat("_DepositionConstant", depositionConstant);
link.dissolutionAndDepositionMat.SetFloat("_Layers", (float)TERRAIN_LAYERS);
link.dissolutionAndDepositionMat.SetFloat("_DissolveLimit", dissolveLimit); //nash added it
RenderTexture[] terrainAndSediment = new RenderTexture[3] {
terrainField.WRITE, sedimentField.WRITE, sedimentDeposition.WRITE
};
RTUtility.MultiTargetBlit(terrainAndSediment, link.dissolutionAndDepositionMat);
terrainField.Swap();
sedimentField.Swap();
sedimentDeposition.Swap();
}
/// <summary>
/// Transfers ground to regolith basing on water level, regolith level, max_regolith
/// aka dissolution based erosion
/// </summary>
private void DisintegrateAndDeposit()
{
m_disintegrateAndDepositMat.SetFloat("_Layers", (float)TERRAIN_LAYERS);
m_disintegrateAndDepositMat.SetTexture("_TerrainField", terrainField.READ);
m_disintegrateAndDepositMat.SetTexture("_WaterField", water.main.READ);
m_disintegrateAndDepositMat.SetTexture("_RegolithField", regolithField.READ);
m_disintegrateAndDepositMat.SetFloat("_MaxRegolith", maxRegolith);
RenderTexture[] terrainAndRegolith = new RenderTexture[2] {
terrainField.WRITE, regolithField.WRITE
};
RTUtility.MultiTargetBlit(terrainAndRegolith, m_disintegrateAndDepositMat);
terrainField.Swap();
regolithField.Swap();
}
/// <summary>
/// Calculates flow of field
/// </summary>
public void Flow(RenderTexture onWhat)
{
//main.SetFilterMode(FilterMode.Point);
link.m_outFlowMat.SetFloat("_TexSize", (float)ErosionSim.TEX_SIZE);
link.m_outFlowMat.SetFloat("T", link.timeStep);
link.m_outFlowMat.SetFloat("L", link.PIPE_LENGTH);
link.m_outFlowMat.SetFloat("A", link.CELL_AREA);
link.m_outFlowMat.SetFloat("G", ErosionSim.GRAVITY);
link.m_outFlowMat.SetFloat("_Layers", 4);
link.m_outFlowMat.SetFloat("_Damping", damping);
link.m_outFlowMat.SetTexture("_TerrainField", onWhat);
link.m_outFlowMat.SetTexture("_Field", main.READ);
link.m_outFlowMat.SetFloat("_OverwriteFluidity", overwriteFluidity);
link.m_outFlowMat.SetFloat("_Fluidity", fluidity);
Graphics.Blit(outFlow.READ, outFlow.WRITE, link.m_outFlowMat);
outFlow.Swap();;
link.m_fieldUpdateMat.SetFloat("_TexSize", size);
link.m_fieldUpdateMat.SetFloat("T", link.timeStep);
link.m_fieldUpdateMat.SetFloat("L", 1f);
link.m_fieldUpdateMat.SetTexture("_OutFlowField", outFlow.READ);
Graphics.Blit(main.READ, main.WRITE, link.m_fieldUpdateMat);
main.Swap();
//main.SetFilterMode(FilterMode.Bilinear);
}
/// <summary>
/// Calculates water velocity
/// </summary>
public void CalcWaterVelocity(float TIME_STEP)
{
link.m_waterVelocityMat.SetFloat("_TexSize", size);
link.m_waterVelocityMat.SetFloat("L", 1f);
link.m_waterVelocityMat.SetTexture("_WaterField", main.READ);
link.m_waterVelocityMat.SetTexture("_WaterFieldOld", main.WRITE);
link.m_waterVelocityMat.SetTexture("_OutFlowField", outFlow.READ);
Graphics.Blit(null, velocity.READ, link.m_waterVelocityMat);
const float viscosity = 10.5f;
const int iterations = 2;
link.m_diffuseVelocityMat.SetFloat("_TexSize", size);
link.m_diffuseVelocityMat.SetFloat("_Alpha", 1f / (viscosity * TIME_STEP));// CELL_AREA == 1f
for (int i = 0; i < iterations; i++)
{
Graphics.Blit(velocity.READ, velocity.WRITE, link.m_diffuseVelocityMat);
velocity.Swap();
}
}
private void InitMaps()
{
terrainField.ClearColor();
//waterOutFlow.ClearColor();
//waterVelocity.ClearColor();
//advectSediment.ClearColor();
//waterField.ClearColor();
//sedimentField.ClearColor();
regolithField.ClearColor();
regolithOutFlow.ClearColor();
//sedimentDeposition.ClearColor();
magmaVelocity.ClearColor();
DoubleDataTexture noiseTex;
noiseTex = new DoubleDataTexture("", TEX_SIZE, RenderTextureFormat.RFloat, FilterMode.Bilinear);
GPUPerlinNoise perlin = new GPUPerlinNoise(m_seed);
perlin.LoadResourcesFor2DNoise();
m_noiseMat.SetTexture("_PermTable1D", perlin.PermutationTable1D);
m_noiseMat.SetTexture("_Gradient2D", perlin.Gradient2D);
for (int j = 0; j < TERRAIN_LAYERS; j++)
{
m_noiseMat.SetFloat("_Offset", m_offset[j]);
float amp = 0.5f;
float freq = m_frequency[j];
//Must clear noise from last pass
noiseTex.ClearColor();
//write noise into texture with the settings for this layer
for (int i = 0; i < m_octaves[j]; i++)
{
m_noiseMat.SetFloat("_Frequency", freq);
m_noiseMat.SetFloat("_Amp", amp);
m_noiseMat.SetFloat("_Pass", (float)i);
Graphics.Blit(noiseTex.READ, noiseTex.WRITE, m_noiseMat, (int)m_layerStyle[j]);
noiseTex.Swap();
freq *= m_lacunarity[j];
amp *= m_gain[j];
}
float useAbs = 0.0f;
if (m_finalNosieIsAbs[j])
{
useAbs = 1.0f;
}
//Mask the layers that we dont want to write into
Vector4 mask = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
mask[j] = 1.0f;
m_initTerrainMat.SetFloat("_Amp", m_amp[j]);
m_initTerrainMat.SetFloat("_UseAbs", useAbs);
m_initTerrainMat.SetVector("_Mask", mask);
m_initTerrainMat.SetTexture("_NoiseTex", noiseTex.READ);
m_initTerrainMat.SetFloat("_Height", TERRAIN_HEIGHT);
//Apply the noise for this layer to the terrain field
Graphics.Blit(terrainField.READ, terrainField.WRITE, m_initTerrainMat);
terrainField.Swap();
}
//dont need this tex anymore
noiseTex.Destroy();
}
