bump maps somehow don`t work

[vinced]

Hi,
somehow my bumpmaps don`t work. They are nearly not visible. Colormaps are working, but bump maps not. I have exported a simple cube model from cinema4d with cubemapping.
Is there some kind of trick?
I`ve used floatimage and image and changed the PowerSlider.

Greetings
vinced

[radiance]

hi,

a screenshot or test file would be handy, it's difficult to know what it might be without any more information.
usually it's because you're model is way too large, eg exported in the wrong scale, which can be corrected in the obj mesh import preferences panel,
or on export in your 3d host app.

you also have to have your model UV mapped prior to export

Radiance

[vinced]

I have sent you the files, a screenshot and an example image, which shows what i wanted to achieve.

vinced

[radiance]

Hi,

you're scene is way too large.
it's currently 30 meters wide,
if you use a bump map which works in centimeter space, it won't be very apparent.

you need to import in the correct scale/units in the OBJ import preferences,
and use a glossy material to see the bump better.

octane expects one unit to be one meter.

Radiance

[vinced]

Hi Radiance,

i think it is not a scaling problem as i am able to scale the texture with the slider. But if you think so, i have tested my bump maps also on the diffuse material with the result that the bumping effect is at best very subtle. To compare it with other rendering programs that use a scale from 0 to 100 or 0 to 1 the maximum bump effect in octane compares to 10 to 20 respectively 0.1 to 0.2.
Unless i am not doing something terribly wrong my wish would be to increase the possible bump effect in future Octane versions.

Greetings
vinced

[radiance]

No,

it's not the bump map scale it's your model which is too big.
if you work in for example centimeters, and export to OBJ, then load it into octane without setting the import preferences to 'centimeters', octane assumes you're model is in meters, and you end up with a model that's kilometers large.

since bump mapping works on a centimeter scale (and usually is only for milimeter like values), it loses it's effect because you're model is too big.

you need to make sure you're model is scaled in meters.

Radiance

[vinced]

But what about the diffuse Material scene in Octane? It should be in the correct scale shouldn`t it?
Same problem here.

vinced

[radiance]

But what about the diffuse Material scene in Octane? It should be in the correct scale shouldn`t it?
Same problem here.

vinced

it's not about materials, it's about your object, you're object is too large.
imagine having bumps of 1 milimeter on a coffeetable that's one square meter.
imagine i enlarge that model to 1 square kilometer, and you look at it from 1 kilometer away, will you still see the bumps ? no...

Radiance

[vinced]

I think we are not talking about the same thing.
I`ll try to make it clearer:
I go into the graph editor, right click -> materials ->diffuse,
left click on difuse material,
in the node inspector i change on the left hand side of the bump field to floatimage.
i choose a bumpmap and open it.
Bump effect is visible but very subtle. I see no way to increase it further.
Maybe a lighting thing? Left click on preview enviroment. I choose daylight. Bump effect stays subtle.

no imported model involved.
I think this materialscene is scaled correctly, as it is not from me but coming with Octane.

vinced

[radiance]

you should use a glossy material, a diffuse material with uniform environment light does'nt have any highlights.
switch the environment to daylight, then switch the material to glossy and you'll see the bumps.

Radiance