Cycles: wrong bump map mapping??

hi there,
i am trying to work with this new cool hot sexy Blender renderer.

i am stuck at bump mapping phase. i have mapped diffuse, image texture and everything went fine.
according to old school, the final touch would have to be to add the same image texture INVERTED, to have black numbers bumped…
black, to have them inset…


but, as u can see, no bump effect even if the file is a PNG B&W one.
already tried several other ways, like B&W converter, mixing and so on…
wasted 1 hour w/o any result :frowning:

could u give some hints pls?

ty vm!!

Double check you have enabled Renderer Feature set to Experimental (Bump mapping still experimental in Cycles ) and then in Object Data (tab near Material settings with triangle icon) select Bump method?

sorry, but i can’t follow you :frowning:
can’t find ANY Object data panel nor any triangle icon… can u post a screen pls?

10 characters


ty for the screen :smiley:

bump method was already selected.
i still can’t understand why a black and white map is not working :frowning:

Works for me, can you try different texture, maybe it have problem. I use first colored texture that found, but it work even when converted to BW using node.


Generally, there are cases where you would not see a very noticeable bump if you’re just plugging the image into the displacement output, you would instead thread the information through a math node where you would multiply the value to a point where it is easily seen.

I think this would be a case that requires the math node because it would seem that you would have sharp transitions between black and white.

and normally you need to feed your image into a RGB to BW node then add a multiply node before going into the displacemnt input

salutations

do you use the goldish texture for bumping? with a math node “greater then” you can mask the numbers out to white on black. …

hi guys, wow, lots of replies!

well, the bump map, according to old blender habits is natively B&W, tbh is alpha&black, in this case, as i simply inverted the numbers texture in black, to have the number themselves a bit inset…
don’t know if that may be the problem: i could reproduce some dislocation and bumping using a procedural texture for another material, so i am sure bumping works fine even w/o particular “tricks”…

i was wondering if it is a matter of texture, image texture or …?
the bump image is a PNG, with transparency around the numbers and just the number themselves in FULL black.

i will now try with a math node the return back to you…
will also try with a BLACK and WTHIE JPG file, rather than the hybrid PNG one.
wait for me, i’ll be back ^^

no way :frowning:

here’s the new configuration, also using a JPG B&W image for bumping:



in the math 3d i used various combinations of values but nothing changed… :frowning:

You’re supposed to leave the second input blank and instead put in a number value, or did you already try that.

darn, i thaught i replied to you, but i was wrong :frowning:

i wrote i already tried several combination and yeah, i tried also with the second one blank… :frowning:

i think i have solved the issue: reading somewhere about “sharp” transition, i decided to to a last desperate try: blurring edges…

ET VOILÀ!

now everything works fine!

Attachments


so you need a grey map not a black and white one !

salutations

sounds like.

at least there should be a smooth transition from white to black area…

did you do a sample file showing these 2 effects
to see the difference

could be use later on as a reference thread for this problem!

thanks

sure thing sir :slight_smile:

will post as soon as i will have a final render.
i am now trying an animation so i have busy mac :smiley:

will post both render and bump map: in this specific case i found lot of difficulties to have the result i expected, that’s why final material is not as i wanted, but at least does its job a bit better than previous tests

but if you have a black/ w image how can you blur the edges

is it inside blender or done in Gimp for instance ?

thanks

gimp-ed :smiley: