/// <summary>
/// Calculate the road's vertices and form triangles
/// </summary>
private void generateShape()
{
// 4 vertices for each point along the road - each forms a cross section
vertices = new Vector3[roadLinePoints.Length * 4];
// 8 triangles for each set of 2 cross sections, plus 4 additional for the endpoints
// Each triangle contains three points
triangles = new int[((roadLinePoints.Length - 1) * 8 + 4) * 3];
// For each point on the line, generate a rectangle (cross section)
// perpendicular to the line to the next point.
for (int i = 0; i < roadLinePoints.Length; i++)
{
Vector3 a = roadLinePoints[i];
Vector3 fromPrevious = new Vector3();
Vector3 toNext = new Vector3();
if (i > 0)
{
fromPrevious = roadLinePoints[i] - roadLinePoints[i - 1];
}
if (i < roadLinePoints.Length - 1)
{
toNext = roadLinePoints[i + 1] - roadLinePoints[i];
}
Vector3 direction = ((fromPrevious.normalized + toNext.normalized) / 2).normalized;
MeshRoadCrossSection crossSection = new MeshRoadCrossSection(a, direction, this);
// Add vertices to set now
vertices[i * 4] = crossSection.topLeft;
vertices[i * 4 + 1] = crossSection.topRight;
vertices[i * 4 + 2] = crossSection.bottomLeft;
vertices[i * 4 + 3] = crossSection.bottomRight;
}
triangles = MeshRoadUtil.getStandardMeshTriangles(roadLinePoints.Length);
}
/// <summary>
/// Change the shape of a terrain to fit the bottom of this road.
/// </summary>
/// <param name="terrain">Terrain to be shaped.</param>
private void fitTerrainToRoad(Terrain terrain)
{
TerrainData data = terrain.terrainData;
int width = data.heightmapWidth;
int height = data.heightmapHeight;
// TODO: Optimize by not grabbing the entire heightmap, just what the road overlaps
float[,] heightmap = data.GetHeights(0, 0, width, height);
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
Vector3 rayStart = MeshRoadUtil.terrainPointToWorld(new Vector3(x, y, 0), terrain);
RaycastHit hit;
if (GetComponent <MeshCollider>()
.Raycast(new Ray(rayStart, terrain.transform.up), out hit, data.size.y))
{
// Calculate where to set height
heightmap[x, y] = MeshRoadUtil.terrainHeightFromWorld(hit.point.y, terrain);
}
}
}
data.SetHeights(0, 0, heightmap);
}