void Start()
{
for (int i = 0; i < 128; ++i)
{
for (int j = 0; j < 128; ++j)
{
uint scrambleU = 5569;
uint scrambleV = 95597;
// Vector2 randomSample = new Vector2(Random.value, Random.value);
// Vector2 randomSample = new Vector2(i / 128.0f, j / 128.0f);
Vector2 randomSample = RandomSamplers.Utils.Sample02((uint)(2211 + i + j * 128), scrambleU, scrambleV);
DistributionSample halfwaySample = CosineDistribution.Sample(randomSample);
//DistributionSample halfwaySample = PowerCosineDistribution.Sample(randomSample, 0);
GameObject sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
sphere.transform.position = halfwaySample.Direction * 10.0f;
sphere.transform.localScale = new Vector3(0.05f, 0.05f, 0.05f);
}
}
for (int i = 0; i < 128; ++i)
{
for (int j = 0; j < 128; ++j)
{
uint scrambleU = 5569;
uint scrambleV = 95597;
Vector2 randomSample = RandomSamplers.Utils.Sample02((uint)(2211 + 128 * 128 + i + j * 128), scrambleU, scrambleV);
DistributionSample halfwaySample = CosineDistribution.Sample(randomSample);
//DistributionSample halfwaySample = PowerCosineDistribution.Sample(randomSample, 0);
GameObject sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
sphere.transform.position = new Vector3(halfwaySample.Direction.x * 10.0f,
halfwaySample.Direction.y * -10.0f,
halfwaySample.Direction.z * 10.0f);
sphere.transform.localScale = new Vector3(0.05f, 0.05f, 0.05f);
}
}
}
public static void ConvoluteLatLong(Texture2D inputMap)
{
Texture2D convoluted = new Texture2D(inputMap.width, inputMap.height, TextureFormat.RGB24, true);
convoluted.filterMode = FilterMode.Trilinear;
convoluted.name = inputMap.name + "_Convoluted";
convoluted.SetPixels(inputMap.GetPixels());
convoluted.Apply(false);
Color[] srcPixels = convoluted.GetPixels();
int srcWidth = convoluted.width;
int srcHeight = convoluted.height;
int mipmapCount = convoluted.mipmapCount;
// Calc total pixels, used by the progress bar and not counting the
// zero'th layer as it is processed nearly instantatious.
int totalPixelCount = 0;
for (int m = 1; m < mipmapCount; ++m)
{
int mipWidth = convoluted.width >> m;
if (mipWidth == 0)
{
mipWidth = 1;
}
int mipHeight = convoluted.height >> m;
if (mipHeight == 0)
{
mipHeight = 1;
}
totalPixelCount += mipHeight * mipWidth;
}
Vector2[] randomSamples = new Vector2[SAMPLES];
uint scrambleU = 5569;
uint scrambleV = 95597;
for (uint s = 0; s < SAMPLES; ++s)
{
randomSamples[s] = RandomSamplers.Utils.Sample02(2211 + s, scrambleU, scrambleV);
}
System.DateTime start = System.DateTime.Now;
// Convolute each miplevel seperately
int pixelsProcessed = 0;
for (int mipLevel = mipmapCount - 1; mipLevel > 0; --mipLevel)
{
int mipWidth = convoluted.width >> mipLevel;
if (mipWidth == 0)
{
mipWidth = 1;
}
int mipHeight = convoluted.height >> mipLevel;
if (mipHeight == 0)
{
mipHeight = 1;
}
EditorUtility.DisplayProgressBar("Convoluting lat long skybox", "Processing " + inputMap.name, pixelsProcessed / (float)totalPixelCount);
float exponent = ExponentFromMipLevel(mipLevel, mipmapCount - 2);
Debug.Log("shininess " + exponent + " at mip level " + mipLevel + " of " + mipmapCount);
// Loop over all pixels
Color[] pixels = new Color[mipWidth * mipHeight];
Threading.Parallel.For(mipWidth, u =>
{
float phi = (((u + 0.5f) / (float)mipWidth)) * 2.0f * Mathf.PI;
for (int v = 0; v < mipHeight; ++v)
{
float theta = (1.0f - (v + 0.5f) / (float)mipHeight) * Mathf.PI;
// Compute direction
Vector3 normal = Utils.Cubemap.SphericalToDirection(theta, phi).normalized;
Vector3 tangent, bitangent;
CreateTangents(normal, out tangent, out bitangent);
// Create samples and sample
Color summedColor = new Color(0.0f, 0.0f, 0.0f, 0.0f);
float totalWeight = 0.0f;
for (int s = 0; s < SAMPLES; ++s)
{
DistributionSample halfwaySample = PowerCosineDistribution.Sample(randomSamples[s], exponent);
if (halfwaySample.PDF > 0.0f)
{
halfwaySample.Direction = tangent * halfwaySample.Direction.x + normal * halfwaySample.Direction.y + bitangent * halfwaySample.Direction.z;
Vector2 sampleUV = Utils.Cubemap.DirectionToSphericalUV(halfwaySample.Direction);
// TODO Perform own repeat-clamp sampling ?
int x = (int)(sampleUV.x * (srcWidth - 1));
int y = (int)(sampleUV.y * (srcHeight - 1));
Color sample = srcPixels[x + y * srcWidth];
float lightScale = Vector3.Dot(halfwaySample.Direction, normal);
summedColor += sample * lightScale;
totalWeight += lightScale;
}
}
int index = u + v * mipWidth;
pixels[index] = summedColor / totalWeight;
}
}
);
convoluted.SetPixels(pixels, mipLevel);
pixelsProcessed += mipWidth * mipHeight;
}
EditorUtility.DisplayProgressBar("Convoluting lat long skybox", "Saving " + inputMap.name, 0.99f);
convoluted.Apply(false, true);
string sourcePath = AssetDatabase.GetAssetPath(inputMap);
string saveFolder = System.IO.Path.GetDirectoryName(sourcePath);
string destPath = saveFolder + "/" + convoluted.name + ".asset";
AssetDatabase.CreateAsset(convoluted, destPath);
Texture2D.DestroyImmediate(convoluted);
EditorUtility.ClearProgressBar();
System.DateTime stop = System.DateTime.Now;
Debug.Log("Conveluted " + sourcePath + " in " + (stop - start).TotalSeconds + "seconds.");
}
