private bool LoadColourMap(SharpDX.Direct3D11.Device device, string colorMapFilename)
{
Bitmap colourBitMap;
try
{
// Open the color map file in binary.
colourBitMap = new Bitmap(DSystemConfiguration.DataFilePath + colorMapFilename);
}
catch
{
return(false);
}
// This check is optional.
// Make sure the color map dimensions are the same as the terrain dimensions for easy 1 to 1 mapping.
m_ColourMapWidth = colourBitMap.Width;
m_ColourMapHeight = colourBitMap.Height;
if ((m_ColourMapWidth != m_TerrainWidth) || (m_ColourMapHeight != m_TerrainHeight))
{
return(false);
}
// Calculate the size of the bitmap image data.
int colourImageSize = m_ColourMapWidth * m_ColourMapHeight * 3;
// Read the image data into the color map portion of the height map structure.
int index;
for (int j = 0; j < m_ColourMapHeight; j++)
{
for (int i = 0; i < m_ColourMapWidth; i++)
{
index = (m_ColourMapHeight * j) + i;
DHeightMapType tempCopy = HeightMap[index];
tempCopy.r = colourBitMap.GetPixel(i, j).R / 255.0f; // 117.75f; //// 0.678431392
tempCopy.g = colourBitMap.GetPixel(i, j).G / 255.0f; //117.75f; // 0.619607866
tempCopy.b = colourBitMap.GetPixel(i, j).B / 255.0f; // 117.75f; // 0.549019635
HeightMap[index] = tempCopy;
}
}
// Release the bitmap image data.
colourBitMap.Dispose();
colourBitMap = null;
return(true);
}
private bool LoadMaterialMap(string materialMapFilename)
{
Bitmap materialBitMap;
try
{
// Open the color map file in binary.
materialBitMap = new Bitmap(DSystemConfiguration.DataFilePath + materialMapFilename);
}
catch
{
return(false);
}
// Make sure the material index map dimensions are the same as the terrain dimensions for 1 to 1 mapping.
if ((materialBitMap.Width != m_TerrainWidth) || (materialBitMap.Height != m_TerrainHeight))
{
return(false);
}
// Initialize the position in the image data buffer so each vertice has an material index associated with it.
// Read the material index data into the height map structure.
int index;
for (int j = 0; j < m_TerrainHeight; j++)
{
for (int i = 0; i < m_TerrainWidth; i++)
{
index = (m_TerrainHeight * j) + i;
DHeightMapType tempCopy = HeightMap[index];
tempCopy.rIndex = (int)materialBitMap.GetPixel(i, j).R;
tempCopy.gIndex = (int)materialBitMap.GetPixel(i, j).G;
tempCopy.bIndex = (int)materialBitMap.GetPixel(i, j).B;
HeightMap[index] = tempCopy;
}
}
// Release the bitmap image data.
materialBitMap.Dispose();
materialBitMap = null;
return(true);
}
private bool CalculateNormals()
{
// Create a temporary array to hold the un-normalized normal vectors.
int index;
float length;
Vector3 vertex1, vertex2, vertex3, vector1, vector2, sum;
DVectorTypeShareNormal[] normals = new DVectorTypeShareNormal[(m_TerrainHeight - 1) * (m_TerrainWidth - 1)];
// Go through all the faces in the mesh and calculate their normals.
for (int j = 0; j < (m_TerrainHeight - 1); j++)
{
for (int i = 0; i < (m_TerrainWidth - 1); i++)
{
int index1 = (j * m_TerrainHeight) + i;
int index2 = (j * m_TerrainHeight) + (i + 1);
int index3 = ((j + 1) * m_TerrainHeight) + i;
// Get three vertices from the face.
vertex1.X = HeightMap[index1].x;
vertex1.Y = HeightMap[index1].y;
vertex1.Z = HeightMap[index1].z;
vertex2.X = HeightMap[index2].x;
vertex2.Y = HeightMap[index2].y;
vertex2.Z = HeightMap[index2].z;
vertex3.X = HeightMap[index3].x;
vertex3.Y = HeightMap[index3].y;
vertex3.Z = HeightMap[index3].z;
// Calculate the two vectors for this face.
vector1 = vertex1 - vertex3;
vector2 = vertex3 - vertex2;
index = (j * (m_TerrainHeight - 1)) + i;
// Calculate the cross product of those two vectors to get the un-normalized value for this face normal.
Vector3 vecTestCrossProduct = Vector3.Cross(vector1, vector2);
normals[index].x = vecTestCrossProduct.X;
normals[index].y = vecTestCrossProduct.Y;
normals[index].z = vecTestCrossProduct.Z;
}
}
// Now go through all the vertices and take an average of each face normal
// that the vertex touches to get the averaged normal for that vertex.
for (int j = 0; j < m_TerrainHeight; j++)
{
for (int i = 0; i < m_TerrainWidth; i++)
{
// Initialize the sum.
sum = Vector3.Zero;
// Initialize the count.
int count = 9;
// Bottom left face.
if (((i - 1) >= 0) && ((j - 1) >= 0))
{
index = ((j - 1) * (m_TerrainHeight - 1)) + (i - 1);
sum[0] += normals[index].x;
sum[1] += normals[index].y;
sum[2] += normals[index].z;
count++;
}
// Bottom right face.
if ((i < (m_TerrainWidth - 1)) && ((j - 1) >= 0))
{
index = ((j - 1) * (m_TerrainHeight - 1)) + i;
sum[0] += normals[index].x;
sum[1] += normals[index].y;
sum[2] += normals[index].z;
count++;
}
// Upper left face.
if (((i - 1) >= 0) && (j < (m_TerrainHeight - 1)))
{
index = (j * (m_TerrainHeight - 1)) + (i - 1);
sum[0] += normals[index].x;
sum[1] += normals[index].y;
sum[2] += normals[index].z;
count++;
}
// Upper right face.
if ((i < (m_TerrainWidth - 1)) && (j < (m_TerrainHeight - 1)))
{
index = (j * (m_TerrainHeight - 1)) + i;
sum.X += normals[index].x;
sum.Y += normals[index].y;
sum.Z += normals[index].z;
count++;
}
// Take the average of the faces touching this vertex.
sum.X = (sum.X / (float)count);
sum.Y = (sum.Y / (float)count);
sum.Z = (sum.Z / (float)count);
// Calculate the length of this normal.
length = (float)Math.Sqrt((sum.X * sum.X) + (sum.Y * sum.Y) + (sum.Z * sum.Z));
// Get an index to the vertex location in the height map array.
index = (j * m_TerrainHeight) + i;
// Normalize the final shared normal for this vertex and store it in the height map array.
DHeightMapType editHeightMap = HeightMap[index];
editHeightMap.nx = (sum.X / length);
editHeightMap.ny = (sum.Y / length);
editHeightMap.nz = (sum.Z / length);
HeightMap[index] = editHeightMap;
}
}
// Release the temporary normals.
normals = null;
return(true);
}
