/// <summary>
/// Adds a grass billboard
/// </summary>
private void AddGrass(VertexTerrain v, List<VertexBillboard> grassVertices, List<int> grassIndices,
Random r, Climate climate)
{
float rg = r.Next(50, 101) / 100.0f;
Vector3 color = Vector3.One;
if (climate == Climate.Tropical)
color = new Vector3(rg, rg, r.Next(40, 101) / 100.0f);
else if (climate == Climate.Polar)
color = new Vector3(rg, rg, rg);
else if (climate == Climate.Dry)
color = new Vector3(rg, rg, r.Next(1, 40) / 100.0f);
Vector2 scale = new Vector2(r.Next(5, 8), r.Next(5, 20) / 10.0f);
grassVertices.Add(new VertexBillboard(v.Position, v.Normal, color, Vector2.Zero, scale));
grassVertices.Add(new VertexBillboard(v.Position, v.Normal, color, Vector2.UnitX, scale));
grassVertices.Add(new VertexBillboard(v.Position, v.Normal, color, Vector2.One, scale));
grassVertices.Add(new VertexBillboard(v.Position, v.Normal, color, Vector2.UnitY, scale));
int[] baseIndices = new int[] { 0, 1, 2, 0, 2, 3 };
int offset = grassIndices.Count / 6 * 4;
for (int i = 0; i < 6; i++)
grassIndices.Add(baseIndices[i] + offset);
}
/// <summary>
/// Adds a tree billboard
/// </summary>
private void AddTree(VertexTerrain v, List<VertexBillboard> treeVertices, List<int> treeIndices,
Random r, Climate climate)
{
Vector3 color;
if (climate == Climate.Polar)
color = new Vector3(1, r.Next(90, 101) / 100.0f, r.Next(90, 101) / 100.0f);
else
color = new Vector3(1, r.Next(90, 101) / 100.0f, r.Next(40, 101) / 100.0f);
Vector2 scale = new Vector2(r.Next(4, 11), r.Next(50, 100) / 10.0f);
treeVertices.Add(new VertexBillboard(v.Position, Vector3.Up, color, Vector2.Zero, scale));
treeVertices.Add(new VertexBillboard(v.Position, Vector3.Up, color, Vector2.UnitX, scale));
treeVertices.Add(new VertexBillboard(v.Position, Vector3.Up, color, Vector2.One, scale));
treeVertices.Add(new VertexBillboard(v.Position, Vector3.Up, color, Vector2.UnitY, scale));
int[] baseIndices = new int[] { 0, 1, 2, 0, 2, 3 };
int offset = treeIndices.Count / 6 * 4;
for (int i = 0; i < 6; i++)
treeIndices.Add(baseIndices[i] + offset);
}
