DWORD
TerrainPatch::BlendValue(double y)
{
if (terrain && y >= 0 && !water) {
// find the proper layer:
for (int i = 0; i < terrain->GetLayers().size(); i++) {
TerrainLayer* layer = terrain->GetLayers().at(i);
if (y >= layer->GetMinHeight() && y < layer->GetMaxHeight()) {
double scale = (y-layer->GetMinHeight()) / (layer->GetMaxHeight()-layer->GetMinHeight());
if (scale < 0.2)
scale = 0;
else if (scale > 0.8)
scale = 1;
else
scale = (scale - 0.2) / 0.6;
if ((i & 1) == 0) {
scale = 1 - scale;
}
DWORD val = (DWORD) (scale*255);
return val << 24;
}
}
}
return 0;
}
int
TerrainPatch::CalcLayer(Poly* poly)
{
if (terrain && poly) {
if (water)
return 0;
double y = 1e6;
for (int i = 0; i < poly->nverts; i++) {
double h = poly->vertex_set->loc[ poly->verts[i] ].y;
if (h >= 0 && h < y) {
y = h;
}
}
if (y <= terrain->GetLayers().first()->GetMinHeight())
return 0;
for (int i = 0; i < terrain->GetLayers().size(); i++) {
TerrainLayer* layer = terrain->GetLayers().at(i);
if (y >= layer->GetMinHeight() && y < layer->GetMaxHeight()) {
return i;
}
}
}
return -1;
}