dpow3r's avatar
I was mind boggled for one second , i couldn't figure out what the image is from the first glimpse , then i thought this is a worm view of some huge trees . I like how you made the trees , they look fantastic though not very natural but to be honest with you , i think the reflective ground ( or is it supposed to be water ? ) ruined the beauty of the image.

Good luck in the competition and keep up the good work :) .
phresnel's avatar
-> "i couldn't figure out what the image is from the first glimpse"

Not at all, or did you have (which would be awesome) problems deciding on whether this is a photograph or a rendering? Or is there too much visual noise?


-> "though not very natural"

May I ask you why? (I don't feel offended or so, I am just curious :D)


-> "or is it supposed to be water ?"

Yes (I knew I should better apply noise on it) :P


-> "Good luck in the competition and keep up the good work :)"

Thank you very, very much :)
dpow3r's avatar
"Not at all, or did you have (which would be awesome) problems deciding on whether this is a photograph or a rendering? Or is there too much visual noise?"

I guess because there is too much visual noise.

"May I ask you why? (I don't feel offended or so, I am just curious :D)"

Its hard to tell precisely but the leaves of the tree are very uniform in orientation and position also the tree branches seems to follow some pattern.

Take a look at this image [link] no branch is similar to another , i think that's what makes trees in nature look interesting.

I never expected you to add the L-System to picogen so quickly , congratulations you definitely deserve some rest now.
phresnel's avatar
Btw, do you think the lighting on the leaves is okay? Imho, it looks very similar to what I see at sunset/rise, when the sun-disk (argh, I graphics-program too much) is occluded by trees.
dpow3r's avatar
No , the lighting of the leaves is not okay , its PERFECT (i really mean it).I forgot to tell you this but i think you did a pretty amazing job at implementing the translucent material , if only you can improve the tree-generation process a little bit more I'm certain that you will reach photorealism.

You gave me enough motivation in this deviation to move my lazy ass and work harder.Thank you :)
phresnel's avatar
"PERFECT" -> oh wow, thank you very very much :D It is actually a pretty hacky hack. It is 50% lambertian reflection, and 50% lambertian reflection transformed into a transmissive BSDF (the "transformer" is inspired by PBRT)

"tree-generation" -> I see. Admittedly, I was too lazy to define an awesome L-System and just took one from "Algorithmic Beauty of Plants" (a free book). The one you've shown should be possible in structure already, and then the missing link is spline-interpolation, and better leaf-distros :)


"motivation" -> I am amazingly glad if that is true :) I see a lot of potential, seeing how much you've improved on ompf that fast
phresnel's avatar
"Its hard to tell precisely but the leaves of the tree are very uniform in orientation and position"

Working on that. Once trees make it into release, one will have to choose some kind of distribution (like "disk", "sphere", "cylindrical") and stuff ... and then, ..., profit :D

Thanks also for the tree-image-link. The formation of this tree should already by possible with picogen, having implemented stochastic l-systems. Though I also need to implement spline interpolation between tree-nodes.
phresnel's avatar
"I guess because there is too much visual noise."

I see. I had that feeling for a moment, too. But then there is a jungle-photograph atop my computer screen that is even noisier, hence I thought it'd be okay :S :D