 | | | Particles with transparency | Particles with transparency 2003-12-12 - By Michael J. H. Brooks
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Hello Dale:
> I just looked over the Snow flake file that Brian Hinton provided with
> his article on particles in the new 3d e-magazine for Carrara. I noticed
> that when the rectangular "snowflake" squares rest flat on the ground
> plane, the transparency effect is gone. I see a flat rectangle with a
> flake in the center. Is this an issue with the particle emitter?
>
> I tried playing with the shader and with the render settings... even
> with light through transparency checked and full ray tracing selected I
> can still see a rectangle when the particle lays flat on the infinite
> plain used as the ground surface.
>
> The only thing that worked was to raise the ground plane up higher, so
> that the particles passed clear through it before laying flat.
>
> DaleP
I don't have the Snow Flake example you mentioned but I created a Carrara 3
scene with an infinite plane, a "rain" particle emitter and a transparent
shader on the particles. I then adjusted the Renderer to have "Light
Through Transparency" enabled. To my surprise, the particles are
transparent until they come to rest on the infinite plane. At that point
they, or possibly their shadows, appear to stop following the rules of
transparency.
Ouch... that was very observant of you... good spot!
However, I found that if I moved the particle emitter UP a bit above the
ground that the problem went away. I used emitter z = (emitter height / 2 +
0.1) which is slightly different that what you did since the particles come
to rest just above the ground. This workaround still allows the particles
to visibly pile up.
Michael
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