Tuesday, 14 June 2011

Blender 2.5 - Cycles - grass

Can't do hair, yet, can do grass :)

As i noticed, grass is almost always done by 'hair' particle system. In cycles, for now, this ain't gonna work. Now, there is an alternative, instead of hair go with emitter (it worked for me).
Of course, this type of grass can be used in other render engines. And i think that this is a better way to achieve realism.

Really simple actually. You start with one simple stalk, and one simple stalk texture, and do UV stuff that goes with it.

Then, duplicate that stalk few times, and do some variations with all of them.

Now, create one plane, and apply particle system. Within emission parameter, set number of copies. If you are rendering frame 1, set start to -5 and end to -4. Lifetime... just put some big number.
Display - if your computer is slow, reduce diplay number.
In render settings, choose object and instead of particles select your group of stalks.
In physics, set it to NO, size to 1, random size to 0.500.

It should be like in an image below.

...or texture preview.

...aaaaand i put same grass material, really basic.

...aaaaand played a bit with some compositing nodes...

That's it. I hope you'll find this useful!
I'll upload video tutorial of this in a next few days (if this is a little confusing).

- - - - - - - - - - -

Now you can watch video tutorial as well. You can watch tutorial here or on youtube.

Tuesday, 7 June 2011

Blender 2.5 - Cycles - Black dots

Ok, here's the thing, i tried in many ways to see why and when those dots appearing. So i made a few scenes similar to the parts of Alex's scene, and, you can say that lighting is causing the problem, but i guess material too should be controled, as well objects intersetcions.

a) Image with dots (100 passes)

b) comparing with material differences

Now, if object (light), is intersecting with another object (with velvet material, as it is in my case), result will be like in an image above, dots start to apearing. If you try to change materials or recalculate normals...nope, same thing happening. So i drag those light's a little higher, to make some distance between lights and regular objects, and render it again, dots disappeared.

c) comparing

d) no dots (100 passes)

So, i think this might be solution, if it's not, please send me a comment, and we'll try again.

Thursday, 2 June 2011

Blender 2.5 - Cycles - Citroen DS

After speed modeling comes quick render. And still experimentations with Cycles. Whole work was one day job, so it isn't perfect,  but results i really like.

Wednesday, 1 June 2011

Blender 2.5 - speed modeling - Citroen DS

Actually, i've only wanted to work on renderings. But then, i decided (for a change) to record my workflow. So, here is only modeling. Reference images i used in this recording are from, and other images i've found on google. It's a bit faster than i wanted to be, but i hope you'll see how i worked on it. Have fun!