public void CalcNormals(TerrainBlock[,] blocks)
{
bool not_above = J - 1 < 0;
bool not_below = J + 1 >= blocks.GetLength(0);
bool not_left = I - 1 < 0;
bool not_right = I + 1 >= blocks.GetLength(1);
Vector3 top_r = not_above ? Vector3.Zero : blocks[I, J - 1].br_helper ;
Vector3 top_l = not_above ? Vector3.Zero : blocks[I, J - 1].bl_helper ;
Vector3 right_t = not_right ? Vector3.Zero : blocks[I + 1, J].tl_helper ;
Vector3 right_b = not_right ? Vector3.Zero : blocks[I + 1, J].bl_helper ;
Vector3 bot_r = not_below ? Vector3.Zero : blocks[I, J + 1].tr_helper ;
Vector3 bot_l = not_below ? Vector3.Zero : blocks[I, J + 1].tl_helper ;
Vector3 left_t = not_left ? Vector3.Zero : blocks[I - 1, J].tr_helper ;
Vector3 left_b = not_left ? Vector3.Zero : blocks[I - 1, J].br_helper ;
Vector3 tl = not_above || not_left ? Vector3.Zero : blocks[I -1, J-1].br_helper ;
Vector3 tr = not_above || not_right ? Vector3.Zero : blocks[I +1, J-1].bl_helper ;
Vector3 bl = not_below || not_left ? Vector3.Zero : blocks[I -1, J+1].tr_helper ;
Vector3 br = not_below || not_right ? Vector3.Zero : blocks[I + 1, J+1].tl_helper ;
if (type == Diagonal.tlbr) {
//top triangle
Vector3 ttr = top.normal + top_r + tr + right_t ;
Vector3 ttl = top.normal + bottom.normal + top_l + tl + left_t ;
Vector3 tbr = top.normal + bottom.normal + bot_r + br + right_b ;
top.CalcNormals(ttr, ttl, tbr);
//bottom triangle
Vector3 btl = ttl;
Vector3 bbl = bottom.normal + bot_l + bl + left_b ;
Vector3 bbr = tbr;
bottom.CalcNormals(btl, bbl, bbr);
}
else {
//bottom triangle
Vector3 btr = top.normal + bottom.normal + top_r + tr + right_t ;
Vector3 bbl = top.normal + bottom.normal + bot_l + bl + left_b ;
Vector3 bbr = bottom.normal + bot_r + br + right_b ;
bottom.CalcNormals(btr, bbl, bbr);
//top triangle
Vector3 ttr = btr;
Vector3 ttl = top.normal + top_l + tl + left_t ;
Vector3 tbl = bbl;
top.CalcNormals(ttr,ttl, tbl);
}
}
public void GenerateTerrainFromNoise()
{
int width = terrain_vertices.GetLength(0);
int height = terrain_vertices.GetLength(1);
//create terrain
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
foreach (var item in noise_gen) {
if (item.add)
terrain_vertices[i,j] += item.getNoise(i,j);
else
terrain_vertices[i,j] *= item.getNoise(i,j);
}
terrain_vertices[i,j] *= scale;
if (i > 0 && j > 0) {
//make and store info about terrain from vertices
terrain_blocks[i-1,j-1] = new TerrainBlock(5,
terrain_vertices[i-1, j-1], terrain_vertices[i, j-1],
terrain_vertices[i-1, j], terrain_vertices[i, j],
i-1, j-1, scale);
}
}
}
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
if (i > 0 && j > 0) {
//compute normals for gouraud shading
terrain_blocks[i - 1, j - 1].CalcNormals(terrain_blocks);
//discover neighbours for all terrain triangles
terrain_blocks[i - 1, j - 1].DiscoverNeighbours(terrain_blocks);
}
}
}
}
public void DiscoverNeighbours(TerrainBlock[,] blocks)
{
bool not_above = J - 1 < 0;
bool not_below = J + 1 >= blocks.GetLength(0);
bool not_left = I - 1 < 0;
bool not_right = I + 1 >= blocks.GetLength(1);
if (type == Diagonal.tlbr)
{
top.neighbours[0] = not_above ? null : blocks[I, J - 1].bottom;
top.neighbours[1] = bottom;
top.neighbours[2] = not_right ? null : blocks[I + 1, J].Left();
bottom.neighbours[0] = not_left ? null : blocks[I - 1, J].Right();
bottom.neighbours[1] = not_below? null : blocks[I, J + 1].top;
bottom.neighbours[2] = top;
}
else
{
top.neighbours[0] = not_above ? null : blocks[I, J - 1].bottom;
top.neighbours[1] = not_left ? null : blocks[I - 1, J].Right();
top.neighbours[2] = bottom;
bottom.neighbours[0] = top;
bottom.neighbours[1] = not_below ? null : blocks[I, J + 1].top ;
bottom.neighbours[2] = not_right ? null : blocks[I + 1, J].Left();
}
}
