On 7/28/2025 8:58 AM, ingo wrote:
>   but so far I don't have an easy way to combine models into one
>> modeling array that would allow for sharp corners.
> 
> Mmmm, what about weighting the knots? for maximum smoothness than handles shoud
> be equally long and have the exact opposite direction. Lets call that a weight
> of 1.
> 
> Weight of 0 could be handle length 0.0. other weights are interpolation of the
> two extrema.
> 
> This scheme is not exact, for example, it does not account for asymmetric
> handles, but it could be a starting point for tinkering.
> 
> With a modeller, no idea if it is not build in.
> 
> ingo
> 
> 
> 
My rough rough rough idea is to build a copy of the Modeling Grid (which 
is a 2D array) with a equally sized grid of <1,1,1,1> values (which 
would cover positive and negative U and positive and negative V 
weights). When I create the control point grid I create the internal 
control points as 1/3rd the distance towards the adjoining point by 
default.

So I could multiply that 1/3rd distance by the weight factor, or just 
default the weight (or smoothness) factor to 1/3 across the board and 
then tighten things up as necessary, making sure to not set any of them 
to 0 because that will collapse the bicubic patch. At least, I think it 
will break the bicubic patch.

I have to play with it down the road. I'm still trying to mimic  Oskar 
Stålberg's irregular grids from Townscaper for this project.

Josh

Post a reply to this message