public void CreateFromPanorama(string file)
{
int texSize = 1024;
var src = new ImageTexture(file);
ImageTexture Create(int faceIndex)
{
var data = new Byte[texSize * texSize * 3];
void SetPixel(int u, int v, Color32 color)
{
var p = texSize * 3 * v + u * 3;
data[p] = (byte)(color.r * 255 + 0.5f);
data[p + 1] = (byte)(color.g * 255 + 0.5f);
data[p + 2] = (byte)(color.b * 255 + 0.5f);
}
Vector3[] vDirA = new Vector3[4];
if (faceIndex == FACE_FRONT)
{
vDirA[0] = new Vector3(-1.0f, -1.0f, -1.0f);
vDirA[1] = new Vector3(1.0f, -1.0f, -1.0f);
vDirA[2] = new Vector3(-1.0f, 1.0f, -1.0f);
vDirA[3] = new Vector3(1.0f, 1.0f, -1.0f);
}
else if (faceIndex == FACE_BACK)
{
vDirA[0] = new Vector3(1.0f, -1.0f, 1.0f);
vDirA[1] = new Vector3(-1.0f, -1.0f, 1.0f);
vDirA[2] = new Vector3(1.0f, 1.0f, 1.0f);
vDirA[3] = new Vector3(-1.0f, 1.0f, 1.0f);
}
else if (faceIndex == FACE_LEFT)
{
vDirA[0] = new Vector3(1.0f, -1.0f, -1.0f);
vDirA[1] = new Vector3(1.0f, -1.0f, 1.0f);
vDirA[2] = new Vector3(1.0f, 1.0f, -1.0f);
vDirA[3] = new Vector3(1.0f, 1.0f, 1.0f);
}
else if (faceIndex == FACE_RIGHT)
{
vDirA[0] = new Vector3(-1.0f, -1.0f, 1.0f);
vDirA[1] = new Vector3(-1.0f, -1.0f, -1.0f);
vDirA[2] = new Vector3(-1.0f, 1.0f, 1.0f);
vDirA[3] = new Vector3(-1.0f, 1.0f, -1.0f);
}
else if (faceIndex == FACE_UP)
{
vDirA[0] = new Vector3(-1.0f, 1.0f, -1.0f);
vDirA[1] = new Vector3(1.0f, 1.0f, -1.0f);
vDirA[2] = new Vector3(-1.0f, 1.0f, 1.0f);
vDirA[3] = new Vector3(1.0f, 1.0f, 1.0f);
}
else if (faceIndex == FACE_DOWN)
{
vDirA[0] = new Vector3(-1.0f, -1.0f, 1.0f);
vDirA[1] = new Vector3(1.0f, -1.0f, 1.0f);
vDirA[2] = new Vector3(-1.0f, -1.0f, -1.0f);
vDirA[3] = new Vector3(1.0f, -1.0f, -1.0f);
}
Vector3 rotDX1 = (vDirA[1] - vDirA[0]) / (float)texSize;
Vector3 rotDX2 = (vDirA[3] - vDirA[2]) / (float)texSize;
float dy = 1.0f / (float)texSize;
float fy = 0.0f;
for (int y = 0; y < texSize; y++)
{
Vector3 xv1 = vDirA[0];
Vector3 xv2 = vDirA[2];
for (int x = 0; x < texSize; x++)
{
Vector3 v = ((xv2 - xv1) * fy) + xv1;
v = v.Normalized();
SetPixel(x, y, Spherical(v));
xv1 += rotDX1;
xv2 += rotDX2;
}
fy += dy;
}
return(new ImageTexture(data, texSize, texSize));
}
Color32 Spherical(Vector3 vDir)
{
float theta = Mathf.Atan2(vDir.z, vDir.x);
float phi = Mathf.Acos(vDir.y);
var m_direction = 0;
theta += m_direction * Mathf.PI / 180.0f;
while (theta < -Mathf.PI)
{
theta += Mathf.PI + Mathf.PI;
}
while (theta > Mathf.PI)
{
theta -= Mathf.PI + Mathf.PI;
}
float dx = theta / Mathf.PI;
float dy = phi / Mathf.PI;
dx = dx * 0.5f + 0.5f;
int px = (int)(dx * src.w);
if (px < 0)
{
px = 0;
}
if (px >= src.w)
{
px = src.w - 1;
}
int py = (int)(dy * src.w);
if (py < 0)
{
py = 0;
}
if (py >= src.w)
{
py = src.w - 1;
}
//Console.WriteLine(px+"-"+ (src.w - py - 1)+"--"+src.w+"-"+py);
Color32 col = src.GetPixel(px, src.w - py - 1);
return(col);
}
buffer[0] = Create(FACE_FRONT);
buffer[1] = Create(FACE_UP);
buffer[2] = Create(FACE_LEFT);
buffer[3] = Create(FACE_BACK);
buffer[4] = Create(FACE_DOWN);
buffer[5] = Create(FACE_RIGHT);
for (int i = 0; i < 6; i++)
{
buffer[i].Save("sky" + i);
}
}
