[PointMaterial] Custom attenuated points parameters

[ketourneau]

Description

Allow custom attenuatedpoints parameters

Motivation and Context

We need to adjust attenuated points parameters for a better rendering in our case.

[AnthonyGlt]

Thank you for the MR.
Could you clean your commits to only keep the last one. The "package" files shouldn't be edited

[AnthonyGlt]

This is a nice feature, could you make these parameters (minAdaptiveSize/maxAdaptiveSize/adaptiveScale) editable by the user when he's loading a pointcloud using a C3DTilesLayer?
Like what was done with the pntsMode parameter. There is an example in examples/3dtiles_pointcloud.html.
By searching where pntsMode is called, it could be possible to implements the same process with pntsMinAdaptiveSize/pntsMaxAdaptiveSize & pntsAdaptiveScale .
(could be helpful #2042)
Don't hesitate to ask if help is needed

[AnthonyGlt]

Maybe could be a good idea to introduce a parameter size_mode: ...., // PNTS_SIZE.ADAPTIVE || PNTS_SIZE.VALUE that would automatically set the size at 0 (when PNTS_SIZE.ADAPTIVE is set) and use minAdaptiveSize/maxAdaptiveSize/adaptiveScale defined by the user.
WDYT ?

[ketourneau]

@AnthonyGlt Thx for your code review.
I applied the change.
I add size_mode parameter, I think it's a more intuitive way to set point size behaviour.
Is everything good ?

[AnthonyGlt]

Looks good to me. After tests, does it answer your needs ?

[AnthonyGlt]

@Desplandis we should implement something similar in C3DTilesLayer, for now only the default preSSE value (1.0) will be used in the material when using a C3DTilesLayer, right ?

Concerning this MR, I think your implementation is enough.