[timberresheim]

hi all,

i need a hint in the right direction how to achieve the look of the promo picture with this beautiful lightpainting , that Mihai did?
http://www.maxwellrender.com/V3/feature/
i can´t wrap my head around how to change the color of the emitter travelling long this spline.
i just learned, that keyframing the luminance channel in cinema 4d doesn´t help at all.

any ideas are greatly appreciated.

thanks in advance

tim

[Nasok]

Hey Tim, well I guess you have to switch to RGB values and animate that channel.

Other way, which I think also could work but a little crazy , you could make an animation for, say, 20 frames and animate emitter along certain path (or what ever) and export it with multi light+color feature .. and do it in post switching the color during animation on post production and because your scene would be static but the light .. could work

Tim.

[Mihai]

Hey Tim, well I guess you have to switch to RGB values and animate that channel.

But you can't do it that way because only the RGB emitter values of the current frame are stored in the MXS You are only outputting and rendering a single MXS with these light painting renders. Just it has a very long exposure set in camera, thus with motionblur on it behaves just like in the real world. I'd like to see this done in other renderers so smoothly....if at all possible to have such long motionblurs.

Somebody else asked this, I wrote some info in the thread here: http://www.maxwellrender.com/forum/view ... 15&t=41341

To animate the colors, what I did in fact is create an elongated triangular shape, so consisting of 3 faces - each with a differently colored emitter. I animated this shape so it spins on it's own axis. Then I parented it to a long thin cylinder. It's actually this illuminated cylinder that's visible in the render itself as it moves, not the actual emitters (which are set to hidden from camera). This is much more efficient in rendering - you get noiseless light trails very quickly compared to having the emitter surfaces themselves visible. Since the parented triangular shape spins on its own axis, it illuminates the cylinder with different colors along its trajectory
I need to do a video tutorial about this.....soon It's a lot of fun to play with light painting!

[timberresheim]

Thanks a ton Mihai for pointing me into the right direction.
fiddled around a bit, but my results are nowhere near your beauty shot there...

*hinthint* a tutorial would be greatly appreciated!!

[Nasok]

Alright that's a great tip actually.
Thanks Mihai .. I also want to try some light paint stuff .. looks cool
I mean I know at least 5 or 6 ways to mimic that in post but not with 3D light .. so it is definitely interesting topic.

Thanks for sharing and I look forward for your tutorial . .should be fun.