This code creates a heightmap using a TVLandscape. Useful if you want to export your terrain data, or if you’re using dynamic terrains. By Rynus_Rein.

Public Function DrawHeightMap(ByVal TVLandscape As TrueVision3D.TVLandscape) As Bitmap
 
   Dim x As Single
   Dim z As Single
 
   Dim posX as single, posZ as single
   Dim LandscapeWidth As Single, LandscapeHeight As Single
   Dim MaxHeight As Single
 
   Dim PointHeight As Single
   Dim PointColor As Single
 
   For x = posX To (LandscapeWidth * 256) + posX
      For z = TposZ To (LandscapeHeight * 256) + posZ
         If TVLandscape.GetHeight(x, z) > MaxHeight Then
            MaxHeight = TVLandscape.GetHeight(x, z)
         End If
      Next z
   Next x
 
 
   LandscapeWidth = LandscapeWidth * 256
   LandscapeHeight = LandscapeHeight * 256
 
   Dim bit As New Bitmap(CInt(LandscapeWidth), CInt(LandscapeHeight))
   Dim g As Graphics = Graphics.FromImage(bit)
   Dim myPen As Pen = New Pen(Color.Blue, 1)
 
   For x = posX To LandscapeWidth + posX
      For z = posZ To LandscapeHeight + posZ
         DoEvents()
 
         PointHeight = TVLandscape.GetHeight(x, z)
 
         PointColor = CInt(255 / MaxHeight * PointHeight)
         myPen.Color = Color.FromArgb(255, PointColor, PointColor, PointColor)
         g.DrawLine(myPen, x, z, x + 1, z + 1)
      Next z
   Next x
   Return bit
 
End Function

And I converted it to C# for the C#-eners

public Bitmap DrawHeightMap(TrueVision3D.TVLandscape TVLandscape)
{
 float x;
 float z;
 float posX;
 float posZ;
 float LandscapeWidth;
 float LandscapeHeight;
 float MaxHeight;
 float PointHeight;
 float PointColor;
 for (int x = posX; x <= (LandscapeWidth * 256) + posX; x++) {
   for (int z = TposZ; z <= (LandscapeHeight * 256) + posZ; z++) {
     if (TVLandscape.GetHeight(x, z) > MaxHeight) {
       MaxHeight = TVLandscape.GetHeight(x, z);
     }
   }
 }
 LandscapeWidth = LandscapeWidth * 256;
 LandscapeHeight = LandscapeHeight * 256;
 Bitmap bit = new Bitmap(System.Convert.ToInt32(LandscapeWidth), System.Convert.ToInt32(LandscapeHeight));
 Graphics g = Graphics.FromImage(bit);
 Pen myPen = new Pen(Color.Blue, 1);
 for (int x = posX; x <= LandscapeWidth + posX; x++) {
   for (int z = posZ; z <= LandscapeHeight + posZ; z++) {
     DoEvents();
     PointHeight = TVLandscape.GetHeight(x, z);
     PointColor = System.Convert.ToInt32(255 / MaxHeight * PointHeight);
     myPen.Color = Color.FromArgb(255, PointColor, PointColor, PointColor);
     g.DrawLine(myPen, x, z, x + 1, z + 1);
   }
 }
 return bit;
}