public static MeshGpuInstancing WithInstanceCustomAccessor(this MeshGpuInstancing instancing, string attribute, IReadOnlyList <Object> values)
{
Guard.NotNullOrEmpty(attribute, nameof(attribute));
attribute = attribute.ToUpperInvariant();
var expectedType = values.Where(item => item != null).FirstOrDefault()?.GetType();
if (expectedType == null)
{
return(instancing);
}
if (expectedType == typeof(int))
{
var xValues = values.Select(item => item is int val ? val : 0).ToList();
return(instancing.WithInstanceAccessor(attribute, xValues));
}
if (expectedType == typeof(Single))
{
var xValues = values.Select(item => item is float val ? val : 0).ToList();
return(instancing.WithInstanceAccessor(attribute, xValues));
}
throw new ArgumentException(expectedType.Name);
}
public static MeshGpuInstancing WithInstanceAccessors(this MeshGpuInstancing instancing, IReadOnlyList <Transforms.AffineTransform> transforms)
{
Guard.NotNull(instancing, nameof(instancing));
Guard.NotNull(transforms, nameof(transforms));
var xfrms = transforms.Select(item => item.GetDecomposed());
var hasS = xfrms.Any(item => item.Scale != Vector3.One);
var hasR = xfrms.Any(item => item.Rotation != Quaternion.Identity);
var hasT = xfrms.Any(item => item.Translation != Vector3.Zero);
if (hasS)
{
instancing.WithInstanceAccessor("SCALE", xfrms.Select(item => item.Scale).ToList());
}
if (hasR)
{
instancing.WithInstanceAccessor("ROTATION", xfrms.Select(item => item.Rotation).ToList());
}
if (hasT)
{
instancing.WithInstanceAccessor("TRANSLATION", xfrms.Select(item => item.Translation).ToList());
}
return(instancing);
}