displacement tests thread

[pixie]

Dr, wouldn't you mind sharing that tuned preview scene so that we mere mortals could use to do some renders?

[cpfresh]

i think the tuned one was upped already in another thread.
http://www.indigorenderer.com/joomla/fo ... php?t=4209

[cpfresh]

here is my meager attempt at greatness ... this displacement is really awesome. as was above, this material is borrowed from the maxwell site.

[daniel_nieto]

those images drew a smile on my face... they are freakin awesome!!!

[pixie]

@cpfresh
I see one problem in that stone grass implementation... they both have to have different IORs, and AFAIK Indigo don't support IOR maps.. so or stone will loke like grass or grass like stone. Perhaps one might give a great exponent map to grass and a lower to stone, and the future 16bit png might get handy at it...

[zsouthboy]

Dr, I figured out why the bottom isn't being displaced: the <subdivide_curvature_threshold> is too high for something completely flat! change it to 0.0 and watch the displacement happen

[cookieofdoom]

Wow! How long did you guys let these tests render (and on what kind of systems)? They look amazing!

Get yourself a quadcore and you'll wonder what you did without it!

Well, I just ordered a core 2 duo laptop on Ebay. I've got a dual core AMD as my main machine. I should be able to network them and get about the same performance.

here is my meager attempt at greatness ... this displacement is really awesome. as was above, this material is borrowed from the maxwell site.

Amazing. I can't wait to start using this.

[zsouthboy]

@cpfresh
I see one problem in that stone grass implementation... they both have to have different IORs, and AFAIK Indigo don't support IOR maps.. so or stone will loke like grass or grass like stone. Perhaps one might give a great exponent map to grass and a lower to stone, and the future 16bit png might get handy at it...

Just take your IOR map and blend between the two desired IORs..

[Wedge]

Nice tests everyone! I have been quite busy lately to keep up with the news so these types of threads are handy to see.

[zsouthboy]

So displacement doesn't work as I initially expected - Ono, can we have a way of defining the "midpoint" of the displacement? Instead of white spots simply being displaced outwards, black is sent upwards at <b> height / 2 as well. I expected black to stay where the mesh is...

Here's a test (and how I figured out the curve threshold problem). Plane has 10 subdiv levels.

Map generated in photoshop - render->fibers, then 30 px mosiac

[OnoSendai]

Hi zsouthboy,
the a, b and c parameters are coefficients from a quadratic polynomial.
So 'c' is the constant term, and can be used to set a constant displacement.

[CoolColJ]

damn, that looks great guys!

[zsouthboy]

Hi zsouthboy,
the a, b and c parameters are coefficients from a quadratic polynomial.
So 'c' is the constant term, and can be used to set a constant displacement.

Got it - I should've guessed that since you supported the a b and c terms for everything else

I do have another issue though: it seems randomly (when making small changes to the texture) indigo will refuse to subdivide and displace my plane (all the steps say 0 subdivided, 2 skipped)

Change the texture slightly, and it's fine.

Odd.

Edit: I'll attach the offending textures: the one without the "Carpet" text works fine. When i added the text, it didn't subdivide.

Edit2: those are actually huge, I'm wasting bandwidth and the problem is solved, so deleted them

[OnoSendai]

try setting

<subdivide_curvature_threshold>-1</subdivide_curvature_threshold>

in the mesh.

[zsouthboy]

That worked perfectly, thank you Ono.

-1 disables the adaptive algorithm I assume?