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Noise and bump values change with resizing

ZBrush Usage Questions
#1

An annoying problem I always have with Zbrush is that Noise, Noise Bump and Colour Bump values change when an object is resized in a larger document. These values then have to be readjusted to match the original smaller render. For example:

The way I work is that I piece together my artwork in a smaller document window for speed. These pieces are then marked and the document is resized for the final render, and using the markings I re place my objects in the larger document.

This is where my problem occurs. The noise and bump values have changed, or more accurately have NOT changed to accomodate the larger object size. Meaning I have to manually increase all the noise and bump values in the objects material to try and match the original.

My question is- Am I doing something wrong? Is there a way to work around this? Is there some mathematical formulae for me to accurately translate my noise/bump values from the smaller to larger document size.

I’m a 1.55b user, is this still a problem in Z2?

#2

Why not work directly at the size wished ?
A resizing to a “big” size is not a normal way :slight_smile: (problem of pixelisation)
Normaly it’s the inverse!
Pilou

#3

i have this too… and am also on z1.55b still. i do same as you for good workflow start small, multimarker, then resize big and place all again … i cannot offer way to avoid this readjusting materials, i only do always exaggerate my materials in small, and so often enough after resizing i have what i wanted … when i need readjust material, i noticed however that it is often enough to increase the highdynamic range slider at the very bottom of material palette.

#4

Thanks Kokoro. Hopefully Aurick can offer some advice.

Frenchy-It’s way too slow to work at the final output size. Working smaller and doing the final render at a larger size is the only practical solution.

There is no pixelation working this way because the canvas is cleared after resizing and the objects are re-placed onto the canvas using markers.

#5

Thx for the explanation, I was a little out subject :rolleyes:
Pilou

#6

Many material properties (including noise) are based on the canvas dimensions (X,Y and Z).

To see what I mean, draw a sphere with the DotsMetal material and move it around the canvas. The dots will not move with the sphere, and so will seem to move across the sphere.

This is a very useful feature of ZBrush, as it allows multiple objects that share the same material to blend together seamlessly. For example, you can buld a scene of a figure being carved from a block of marble, with each part of the figure being modeled separately. When they’re all assembled, it will look like a single, solid block of marble.

Of course, this does mean that as your object’s scale and position change, so will the material effects.