Skindigo Displacement tests

[crojack]

So, I dived in a started some testing to see if I can figure this out. and, well, I haven't, but I did a few tests to try and get a very ballpark idea of where to start.

I borrowed the mat and the d_map from maxwell

anyways, I wanted to start with something that had been proven, even if it is in another renderer.

So, first is the preview.

No Subdiv, and Dis value at .18

see file comments for each pic.

what I don't understand is that I get no displacement in the actual model render, but when i bump up the Dis. value, it seems to raise the whole mesh toward the camera, instead of displacing the actual material???

Does there need to be some sort of anchor mesh that this bases itself off of?

I will resize images if needed.

[cpfresh]

crojack, get the latest material preview scene. it was updated and improved.

keep up these tests, inquiring sketchy-users want to know!

[zsouthboy]

The reason the mesh seems to move is that you have so few polys - you're "displacing' like 4 triangles, so the whole thing appears to move.

Set your subdiv threshold to "-1", and try again

[crojack]

You mean the Max Subdiv to -1?

I tried that and indigo crashed.

tried .01 and nothing to speak of.

[Kram1032]

-1 means disable, I guess?

[zsouthboy]

Sorry, should've been more specific:

Set the curve threshold to -1

[kwistenbiebel]

I love these tests.
It can really be helpful to users to see different values of the parameters applied. Good to learn from.

I hope other tests follow...

[crojack]

I got this to work
with max Subd at 8
PT -1
CT -1

Dis @ .12


but, change anything or try this with a different mat and things go all wonly again.

i tried this on a wall instead of the ground, no dice. (not sure why that would make a difference)

Is there a correlation between the size of the mesh and the values of the parameters?

not sure if a default is possible, hopefully some more people will try out some tests.

it is fun though, but also frustrating, has anyone found a thread or link explaining what each of the parameters does?

[kwistenbiebel]

Looks nice....but oh boy, this displacement feature seems so difficult to control

[Kram1032]

It's still a bit buggy, I guess... All the displacement releases, 'till now aren't stable... as you know^^ Probably the stuff'll get simpler, later
Simpler, more effective and less buggy^^

[kwistenbiebel]

It's probably not easy for Ono to make a multi platform displacement as each host app probably has its own geometry/mesh specifics.

I reckon, Sketchup is the one that creates the most sloppy geom of all

[Kram1032]

I guess, that's why he decided (and partly undid his decision) to ignore all the exported normals and calculate them in Indigo internally.

[OscarLok]

Hi crojack,

May I have your skp file with the displacement texture, please?

Could anybody upload your skp file together with your example, please?
Or where can I download a example of SKP with displacement testing, please?

Thanks
Regards
Oscar

[neo0.]

How do you assign displacement maps in skindigo?

[Whaat]

Looks nice....but oh boy, this displacement feature seems so difficult to control

It's actually not as hard as you think. The most important parameter is the Max Number of Subdivisions which determines the 'resolution', 'fineness', or 'accuracy' of the displacement and the texture 'b' value (Gain in SkIndigo). This is not much different than Bump mapping.

The more complicated parameters are the 'curvature threshold' and the 'pixel threshold'. I might remove these from the SkIndigo interface if I can find some good default values. The thing to remember about these two values is that you don't NEED to ever change them. AFAIK, the main purpose of these parameters is to optimize the subdivision to save memory.