4
$\begingroup$

I'm a bit newer to blender, so apologies for probably missing some obvious terms.

I am able to create bump maps for objects with hard corners, but when I try to use them on more spherical objects, I can never get what I want. Iwant the bump map to follow the curves of the shape so they are always perpendicular to the faces. (I think the word "normal" is related to this but using the Normal output from a Texture Coordinate node doesn't work.) Imagine a golf ball, or a strawberry with seed divots.

Here's an image of what I'm talking about. This is a strawberry with the seed divots:

straight on strawberry render

It looks fine, until it's rotated:

rotated view of strawberry render

and the divots stretch out. Here's my bump image and here are my material nodes:

blender node graph for strawberry material

I've gotten the most milage out of changing the texture coordinate output and rotating/scaling the mapping node, but it's pretty obvious to me that I'm just flailing around and guessing.

I'm sure there's also a correct term for this that I'd love to know.

| improve this question | | | | |
$\endgroup$
  • 4
    $\begingroup$ in the image texture node change the "Flat" option to "Box". $\endgroup$ – David Feb 27 '17 at 3:31
4
$\begingroup$

The problem here is the texture coordinates/projection of the image, you are currently projecting the image in a single direction onto your mesh. You can think of projection working very much like a film projector here. By selecting 'Box' rather than 'Flat' as David suggested, blender will instead project from 6 different directions (as if a cube was surrounding the object, with the texture on each face). This works reasonably well for simple objects, but can still have problems around the where the corners of box that the image is being projected from are.

To improve on the box projection, you need to do what is called UV unwrapping, which essentially creates a flattened version of the surface of your object which can then be used to map 2d details to the surface of your object. You can find a basic overview here

| improve this answer | | | | |
$\endgroup$
  • $\begingroup$ Thanks for this. I'm surprised sphere wasn't the right projection. Time for another question! $\endgroup$ – Edward Loveall Mar 6 '17 at 18:22

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.