Blender HAIR for Lux

[Dade]

Working on it: http://www.luxrender.net/mantis/view.php?id=654

Done, the cone shape accepts a new optional parameter: "float radius2". For instance:

Shape "cone" "float radius" [1.0] "float radius2" [0.5] "float height" [1.0]

An rendering example:

[jeanphi]

Hi,

Thanks for the new cone option. However since we don't have CSG operations, if you try to render transparent hair, you'll have some strange behaviour at junctions.

Jeanphi

[jensverwiebe]

Hi Dade

Nice work, however, don´t we need an additional " cap ends"-function then ?

Jens

[Dade]

Nice work, however, don´t we need an additional " cap ends"-function then ?

The "height" parameter just define the distance between the 2 caps in the case "radius" and "radius2" parameters are used. It means you can use the new cone shape exactly like cylinder but with 2 "radius" parameters (lower and upper circle) instead of one.

[jensverwiebe]

Dade
Maybe we misunderstood each other.

I meant the cone must be closed at he ends, even if it don´t has radius2 == 0

Is this possible too ? Can read it out of the code neither your answer.
Was it what you meant by "exactly like cylinder" ?
Just asked myself cause your example shows hollow shape.
If not, how will a hair end then, for it does not end as a spike ?

Jens

[sandos]

Or use spheres for capping ends?

[Dade]

Or use spheres for capping ends?

Yup, Jens, aren't you using a sphere at each cylinder start/end ? Can't you do the same for cones ?

[jeanphi]

Hi,

Or you can add a disk shape at each end, that's what a capping end feature would do anyway.
EDIT: long term, we'll need a real primitive for hairs, otherwise we won't be able to use them to model optic fiber style objects

Jeanphi

[psychotron]

this would be great addition to lux... and with SSS propably in future v0.7
organic feasts

[jromang]

There is a paper that could help here : http://www.rhythm.com/~ivan/pdfs/gi98.pdf
Found it there : http://www.rhythm.com/~ivan/hairRender.html