void buildIndices(dae_reader_t *reader, int geometryID)
{
geometry_t *geometry = &reader->geometry[geometryID];
vector<draw_range_t> drawRange;
getDrawRanges(reader, geometryID, drawRange);
geometry->meshes.push_back(drawRange);
computeIndices(reader, geometryID);
}
CTerrain::CTerrain(IDirect3DDevice9* device,
std::string heightmapFileName,
int numVertsPerRow,
int numVertsPerCol,
int cellSpacing,
float heightScale)
{
_device = device;
_numVertsPerRow = numVertsPerRow;
_numVertsPerCol = numVertsPerCol;
_cellSpacing = cellSpacing;
_numCellsPerRow = _numVertsPerRow - 1;
_numCellsPerCol = _numVertsPerCol - 1;
_width = _numCellsPerRow * _cellSpacing;
_depth = _numCellsPerCol * _cellSpacing;
_numVertices = _numVertsPerRow * _numVertsPerCol;
_numTriangles = _numCellsPerRow * _numCellsPerCol * 2;
_heightScale = heightScale;
// 加载高度图
if (!readRawFile(heightmapFileName))
{
::MessageBox(0, _T("readRawFile - FAILED"), 0, 0);
::PostQuitMessage(0);
}
// 高度缩放
for (unsigned int i = 0; i < _heightmap.size(); i++)
_heightmap[i] *= heightScale;
// 计算点点坐标
if (!computeVertices())
{
::MessageBox(0, _T("computeVertices - FAILED"), 0, 0);
::PostQuitMessage(0);
}
// 计算索引
if (!computeIndices())
{
::MessageBox(0, _T("computeIndices - FAILED"), 0, 0);
::PostQuitMessage(0);
}
computeNormals();
}
Terrain::Terrain(IDirect3DDevice9* device,
std::string heightmapFileName,
int numVertsPerRow,
int numVertsPerCol,
int cellSpacing,
float heightScale)
{
_device = device;
_numVertsPerRow = numVertsPerRow;
_numVertsPerCol = numVertsPerCol;
_cellSpacing = cellSpacing;
_numCellsPerRow = _numVertsPerRow - 1;
_numCellsPerCol = _numVertsPerCol - 1;
_width = _numCellsPerRow * _cellSpacing;
_depth = _numCellsPerCol * _cellSpacing;
_numVertices = _numVertsPerRow * _numVertsPerCol;
_numTriangles = _numCellsPerRow * _numCellsPerCol * 2;
_heightScale = heightScale;
// load heightmap
if( !readRawFile(heightmapFileName) )
{
::MessageBox(0, "readRawFile - FAILED", 0, 0);
::PostQuitMessage(0);
}
// scale heights
for(int i = 0; i < _heightmap.size(); i++)
_heightmap[i] *= heightScale;
// compute the vertices
if( !computeVertices() )
{
::MessageBox(0, "computeVertices - FAILED", 0, 0);
::PostQuitMessage(0);
}
// compute the indices
if( !computeIndices() )
{
::MessageBox(0, "computeIndices - FAILED", 0, 0);
::PostQuitMessage(0);
}
}
void render::HeightMap::compute(
unsigned int rows, unsigned int cols,
const float *heights,
int stride,
const math::matrix3x1<float> span,
bool eliminateZeroTriangles,
Texture **textures,
unsigned int levels,
unsigned int M) {
vertices.reserve((rows + 1) * (cols + 1));
for (unsigned int r = 0; r <= rows; r++) {
for (unsigned int c = 0; c <= cols; c++) {
float u = (float)r / (float)rows;
float v = (float)c / (float)cols;
math::matrix3x1<float> p(u * span.x, 0, v * span.z);
if (r < rows && c < cols) {
p.y = heights[(r * cols + c) * stride] * span.y;
}
math::matrix3x1<float> n(0, 1, 0);
geometry::Vertex vertex(p, n, u, v);
vertices.push_back(vertex);
}
}
for (unsigned int r = 1; r < rows - 1; r++) {
for (unsigned int c = 1; c < cols - 1; c++) {
geometry::Vertex &vertex = vertices.at(r * (cols + 1) + c);
const float dy = 0.01f;
math::matrix3x1<float> ne( (heights[(r * cols + c) * stride] - heights[((r + 1) * cols + c) * stride]), dy, 0);
math::matrix3x1<float> nw( heights[((r-1) * cols + c) * stride] - heights[(r * cols + c) * stride], dy, 0);
math::matrix3x1<float> nn( 0, dy, heights[(r * cols + c) * stride] - heights[(r * cols + c - 1) * stride]);
math::matrix3x1<float> ns( 0, dy, heights[(r * cols + c+1) * stride] - heights[(r * cols + c) * stride]);
/*
math::matrix3x1<float> ne( (heightMap.get(r, c) - heightMap.get(r+1, c)), dy, 0);
math::matrix3x1<float> nw( heightMap.get(r-1, c) - heightMap.get(r, c), dy, 0);
math::matrix3x1<float> nn( 0, dy, heightMap.get(r, c) - heightMap.get(r, c-1));
math::matrix3x1<float> ns( 0, dy, heightMap.get(r, c+1) - heightMap.get(r, c));
*/
math::matrix3x1<float> normal = (ne.unit() + nw.unit() + nn.unit() + ns.unit()).unit();
vertex.nx = normal.x;
vertex.ny = normal.y;
vertex.nz = normal.z;
}
}
unsigned int N = 1;
for (unsigned int level = 0; level < levels; ++level) {
meshes.push_back(RigidMesh());
RigidMesh &mesh = meshes.back();
mesh.levelOfDetail = level;
if (textures) {
for (unsigned int i = 0; i < RigidMesh::Num_textures && textures[i]; ++i) {
mesh.textures[i] = 0;
}
}
computeIndices(rows, cols, mesh, N, eliminateZeroTriangles);
N *= M;
}
constructVertexBuffer();
}
