koobas.hobune.stream
Import 8bit .raw file, and 16bit explanation.
Hello, this is my first question here, so please forgive me if I make any mistake. Im trying to create a script that imports .raw heightmaps to a desired terrain (like in the included "Import Heightmap" option. I Googled a lot, and I came with this:
System.IO.FileInfo fi = new System.IO.FileInfo(path);
int size = m_heightMapRes*m_heightMapRes*2;
System.IO.FileStream fs = fi.OpenRead();
byte[] data = new byte[size];
fs.Read(data, 0, size);
fs.Close();
bool bigendian = (m_rawByteOrder == BYTE_ORDER.Mac) ? true : false;
int i=0;
for(int x = 0 ; x < m_heightMapRes; x++)
{
for(int y = 0; y < m_heightMapRes; y++)
{
//Extract 16 bit data and normalize.
float ht = (bigendian) ? (data[i++]*256.0f + data[i++]) : (data[i++] + data[i++]*256.0f);
htmap[m_heightMapRes-x-1,y] = ht / 65535.0f;
}
};
This works for 16bit raw files. What I don't understand: Why "size = m_heightMapRes*m_heightMapRes*2" is multplied by 2? An explanation for the "Extract 16 bit data part"? (I understand the littleendian and bigendian part)
I want to understand it, because I want to convert it to support 8bit files. Yes, im a noob in this. Thanks in advance.
Ok so searhing more y discovered that the size is given by: yRes*xRes*BitDepth (where 2 is 2bytes = 16 bits hehe). So I supose if the file is 8bit it will be size=xRes*yRes ? Still haven't figured out the extract part. Please help :D
Ok, now I understand the normalize part I think. for unsigned integers 16bit range is [0,65535] and 8bit range is [0,255]. It scales the data. So for a 8 bit image will it be like this?
float ht = (bigendian) ? (data[i++]*256.0f + data[i++]) : (data[i++] + data[i++]*256.0f);
htmap[m_height$$anonymous$$apRes-x-1,y] = ht / 256.0f;
Please help.
In case anyone is wondering, this is the solution I achieved:
For 8 bit heightmaps this changes
size = heightMapRes*heightMapRes;
And,
int i = 0;
for(int x = 0 ; x < heightMapRes; x++) {
for(int y = 0; y < heightMapRes; y++) {
//Extract 8 bit data and normalize.
htmap[heightMapRes-x-1,y] = data[i++]/255.0f;
}
};
Obviously you get much worst results with 8 bit heightmaps, but thats not the point here. Thanks for the help guys.
Hi, You are working with 16 bit raw file, 16 bit for each height value. File consist of bytes, which is 8 bit. So, you have to multiply map resolution by 2 to get the byte array size.
