public static void SetDistributionMap(InstancedModel model, DistributionMap value)
{
if (value != null)
{
value.Apply(model);
}
}
private void Apply(InstancedModel model)
{
if (model == null || Texture == null)
{
return;
}
var random = new Random(Seed);
var transforms = new List <Matrix>();
var texture = ContentPipeline.LoadContent <Texture2DContent>(Texture.Filename, new Microsoft.Xna.Framework.Content.Pipeline.TextureImporter());
texture.ConvertBitmapType(typeof(PixelBitmapContent <float>));
var map = (PixelBitmapContent <float>)texture.Mipmaps[0];
for (int z = 0; z < map.Height; z++)
{
for (int x = 0; x < map.Width; ++x)
{
var probability = map.GetPixel(x, z) * Density * 0.0001 * Step * Step;
var count = (int)Math.Floor(probability);
if (random.NextDouble() < probability - count)
{
count++;
}
for (int i = 0; i < count; ++i)
{
var xx = random.NextDouble();
var zz = random.NextDouble();
Matrix transform = new Matrix();
transform.M11 = transform.M33 = HorizontalScale.Min + (float)random.NextDouble() * (HorizontalScale.Max - HorizontalScale.Min);
transform.M22 = VerticalScale.Min + (float)random.NextDouble() * (VerticalScale.Max - VerticalScale.Min);
transform.M44 = 1;
if (RandomizeRotation)
{
Matrix rotation;
Matrix.CreateRotationY((float)random.NextDouble() * MathHelper.Pi * 2, out rotation);
Matrix.Multiply(ref transform, ref rotation, out transform);
}
transform.M41 = (x * Step) + (float)(xx * Step);
transform.M43 = (z * Step) + (float)(zz * Step);
transforms.Add(transform);
}
}
}
model.SetInstanceTransforms(transforms.ToArray());
}
public InstancedModelMesh(InstancedModel model, int index)
{
this.model = model;
this.index = index;
}
public static DistributionMap GetDistributionMap(InstancedModel model)
{
return(null);
}