public static Software.Texel.R32F[,] RandomR32F(Random r, int width, int height)
{
Software.Texel.R32F[,] data = new Software.Texel.R32F[height, width];
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
data[y, x] = new Graphics.Software.Texel.R32F {
R = (float)r.NextDouble()
}
}
}
;
return(data);
}
public static Mesh Construct(MeshFromHeightmap metaResource)
{
if (!metaResource.PointSample)
{
throw new NotImplementedException("Use point sampling");
}
var indexedPlane = Construct(metaResource.Grid);
var gridPos = Common.Math.ToVector2(metaResource.Grid.Position);
Vector2 gridStep = new Vector2(metaResource.Grid.Size.X / metaResource.Grid.NWidth,
metaResource.Grid.Size.Y / metaResource.Grid.NHeight);
int heightMapHeight = metaResource.Heightmap.Data.GetLength(0);
int heightMapWidth = metaResource.Heightmap.Data.GetLength(1);
for (int i = 0; i < indexedPlane.VertexBuffer.Count; i++)
{
var v = indexedPlane.VertexBuffer[i];
// A value between [0, 1] relative to the mesh
Vector2 relativePosition = (Common.Math.ToVector2(v.Position) - gridPos);
relativePosition.X /= metaResource.Grid.Size.X;
relativePosition.Y /= metaResource.Grid.Size.Y;
// And translate that position into the Rectangle square
relativePosition.X =
metaResource.Rectangle.X + relativePosition.X * metaResource.Rectangle.Width;
relativePosition.Y =
metaResource.Rectangle.Y + relativePosition.Y * metaResource.Rectangle.Height;
int absolutePositionX = (int)(relativePosition.X * heightMapWidth);
absolutePositionX = Common.Math.Clamp(absolutePositionX, 0, heightMapWidth - 1);
int absolutePositionY = (int)(relativePosition.Y * heightMapHeight);
absolutePositionY = Common.Math.Clamp(absolutePositionY, 0, heightMapHeight - 1);
Texel.R32F height = metaResource.Heightmap.Data[absolutePositionY, absolutePositionX];
v.Position = new Vector3(v.Position.X, v.Position.Y, metaResource.Grid.Position.Z + height.R * metaResource.Height);
// Calculate normal
/*float hl = metaResource.Heightmap.Data[absolutePositionY,
* Math.Max(absolutePositionX - 1, 0)].R;
* float hr = metaResource.Heightmap.Data[absolutePositionY,
* Math.Min(absolutePositionX + 1, heightMapWidth - 1)].R;
* float ht = metaResource.Heightmap.Data[
* Math.Max(absolutePositionY - 1, 0),
* absolutePositionX].R;
* float hb = metaResource.Heightmap.Data[
* Math.Min(absolutePositionY + 1, heightMapHeight - 1),
* absolutePositionX].R;
* Vector3 l = new Vector3(-gridStep.X, 0, hl - height.R);
* Vector3 r = new Vector3(+gridStep.X, 0, hr - height.R);
* Vector3 t = new Vector3(0, -gridStep.Y, ht - height.R);
* Vector3 b = new Vector3(0, +gridStep.Y, hb - height.R);
* Vector3 n = Vector3.Cross(l, t) + Vector3.Cross(r, b);
* n.Normalize();
* v.Normal = n;*/
v.Normal = TextureUtil.NormalFromHeightmap(metaResource.Heightmap.Data,
relativePosition, gridStep, new Size(heightMapWidth, heightMapHeight));
indexedPlane.VertexBuffer[i] = v;
}
//indexedPlane.RecalcNormals();
return(indexedPlane);
}
