Volume Render for Unity, inlcude suface volume render and direct volume render. Volume dataset can be raw data or dicom file.
- Ray-Casting
float3 objViewDir;
float3 startPosition;
for (int i = 0; i < MAX_SAMPLE_COUNT; i++) {
float3 uvw = startPosition + 0.5;
if (outside) break;
// getDensity(uvw);
// calculate color
// next pos
startPosition += objViewDir * SAMPLE_STEP_SIZE;
}
- Phong Lighting Model
float3 ambient = float3(ka, ka, ka) * tfColor;
float3 diffuse = float3(kd, kd, kd) * max(dot(N, L), 0) * tfColor;
float3 specular = float3(ks, ks, ks) * pow(max(dot(V, F), 0), power) * tfColor;
float3 color = ambient + diffuse + specular;- generate alphamap and colormap
Texture2D texture = new Texture2D(TEXTURE_WIDTH, TEXTURE_HEIGHT, TextureFormat.RGBAFloat, false);
Color[] tfCols = new Color[TEXTURE_WIDTH * TEXTURE_HEIGHT];
List<TFColourControlPoint> cols;
List<TFAlphaControlPoint> alphas;
for (int iX = 0; iX < TEXTURE_WIDTH; iX++)
{
// calculate color from cols and alphas
Color pixCol;
// set value
for (int iY = 0; iY < TEXTURE_HEIGHT; iY++)
{
tfCols[iX + iY * TEXTURE_WIDTH] = pixCol;
}
}
dicom format： https://it.wikipedia.org/wiki/DICOM
fo-dicom：https://github.com/fo-dicom/fo-dicom
FileStream fs = File.OpenRead(filepath);
DicomFile dcmFile = DicomFile.Open(fs);
DicomImage dcmImage = new DicomImage(dcmFile.Dataset);
int width = dcmImage.Width;
int height = dcmImage.Height;
// read tag info
slope = dcmFile.Dataset.Get<int>(DicomTag.RescaleSlope);
intercept = dcmFile.Dataset.Get<int>(DicomTag.RescaleIntercept);
......
// store CT values
int n = width * height;
int[] data = new int[n];
DicomPixelData header = DicomPixelData.Create(dcmFile.Dataset);
var pixelData = PixelDataFactory.Create(header, 0);
pixelData.Render(null, data);
for (int i = 0; i < n; i++)
{
int value = data[i];
float hounsfieldValue = value * slope + intercept;
short ct = (short)Mathf.Clamp(hounsfieldValue, -1024.0f, 3071.0f);
}DICOM source
- http://www.osirix-viewer.com/datasets/
- http://www.aycan.de/lp/sample-dicom-images.html
- http://www.barre.nom.fr/medical/samples/
- https://estore.merge.com/na/efilmcommunity/sample.html
- http://www.dicomlibrary.com/
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