Questions tagged [normals]

Normals describe how faces and vertices are oriented and can be used to aid various calculations and effects. This tag should be used for questions regarding normals in Blender, from uses to issues.

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39
votes
3answers
67k views

Why are some faces in my mesh darker?

While rendering a mesh with smooth shading on, I get a dark region/shadow on certain faces. The effect is more evident when smooth shading is applied to a mesh containing ngons, with the ngons turning ...
29
votes
7answers
133k views

How to make all faces flip to the right/consistent direction?

What's happening is that I have tried to flip the normals, inside and out, but there are always faces which have to be flipped! Normals recalculated Inside View If I flip them again, all faces get ...
27
votes
9answers
33k views

How to Combine two Normal Maps?

I made a high poly model and then baked its textures onto a low poly model. Now I want to give another normal map's details to the model. How can this be done?
16
votes
1answer
11k views

Liquid / glass interface IOR and normals in Cycles

When modelling / rendering a glass with liquid inside (in Cycles), which direction do the normals for the glass only surfaces, shared glass-liquid surfaces, and liquid only surfaces point? I have ...
15
votes
2answers
9k views

Viewing normals in Blender?

I'm sure there is a way to view the normals, but I can't find it anywhere. Can you please tell me where to find this option? Thanks!
14
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3answers
34k views

How to flatten a face to avoid distortion (make an ngon planar)

I created a kind of procedural modeled ground (rocks desert like), with some decimate modifiers to have a really crazy topology. The result is nice, except for some ngons faces that contains some ...
14
votes
1answer
10k views

Bump Maps vs Normal Maps

I have read the Blender manual regarding bump maps and normal maps. But still it is not very clear to me when you would make or use bump maps and when normal maps. Who can explain ?
13
votes
3answers
48k views

Creating Normal maps from a Texture?

Is it possible to create a Normal Map from a Texture, not a mesh? If so, how? As I'm working on an Eye, and have already made the textures, I was wondering if it was possible to create Normal Maps ...
12
votes
1answer
73k views

How to recalculate normals?

in version of Blender 2.72, where is the option recalculate?. Like in this video https://www.youtube.com/watch?v=IZPqxADetWE&feature=player_detailpage#t=108 Here is a screenshot:
11
votes
2answers
1k views

How can I customize normal in this way?

I want to have my beveled object to have fake-rounded edges: The vertex normals should be vertical with the main surfaces, so that the original surfaces are rendered plain, and the beveled edge is ...
10
votes
2answers
11k views

How can faces be rotated around their individual normals?

In edit mode with these settings: Face selection Pivot point: individual origins Transformation orientation: Normal The faces don't rotate around the normals, is there another required setting that ...
10
votes
3answers
6k views

How to pick target texture image for baking?

I'm trying to bake bump maps into normal maps. I am having problems with the baking process in that it seems to arbitrarily select the image that the bake renders to. Sometimes it bakes to the ...
10
votes
1answer
3k views

How to avoid terminator artifacts while still using smooth shading and the new pointiness attribute?

I'm sure we're all familiar with the Cycles normal bug (aka terminator bug) that causes bad shading on sharp edges when smooth shading is set. The normal fixes to this are to use higher levels of ...
10
votes
3answers
5k views

Baking normal map from a cycles shader with normals

I have a cycles material (diffuse shader) with a procedural normal map on it, which renders as expected in Cycles. But if I bake the normal map it outputs a flat image (0.5, 0.5, 1.0). I've tried ...
10
votes
3answers
8k views

Manually Position Vertex Normals?

I have bunch of objects that I want to position next to each other in a scene. When they are next to each other, there is an apparent seam between them due to different normal directions. The normal ...
10
votes
3answers
2k views

Is it possible to get automatic smooth edges with flat faces without adding geometry?

I'm new with Blender and this seems like a simple thing but I haven't been able to find the answer. The only way I've been able to find to get smooth edges while retaining flat faces is to add extra ...
9
votes
1answer
504 views

How to animate an object so it follows the slope (normal) of another object?

I'd like to animate an object moving over a surface and have the object positioned so it follows the slope (normal) of the surface. Using a shrinkwrap constraint, the object will follow the change in ...
9
votes
2answers
170 views

What do the new popover “Normals” in 2.80 do? How to use it?

I noted a new popover in mesh edit mode: I try to play with it, add custom split normals, auto smooth, but see nothing happens with model. How to use it, or it just doesn't work?
9
votes
3answers
3k views

How to bake high to low poly normals for multiple objects on one normal map?

Imagining I have multiple objects which make up a scene including high poly and low poly of each object and I want to put all of the baked information onto one map. What would be the easiest way to ...
9
votes
2answers
2k views

I have a model and a normal map, can I bake Ambient Occlusion from both?

So I know how to regularly set up ambient occlusion baking in Blender, and I have applied the normal map using Blender Render. However, whenever I try to then bake AO, it does not take the normal map ...
8
votes
4answers
4k views

color faces with wrong normals

While hunting down some wrong-flipped faces I find it a bit tedious to differentiate the color of the wrong-sided face with the right-sided face. It would be very handy if the wrong-sided faces would ...
8
votes
4answers
3k views

Is it possible to effect the spawning direction of a particle with a normal map?

I've been unsuccessful so far in finding information on, or working out how to control the angle that a particle is emitted from using a normal map. What I'm trying to do is create a texture or UV ...
8
votes
3answers
2k views

Why can I see through a box in blender game engine? [duplicate]

I have a problem where I can see through a box in blender game, see picture. This effect changes so that the near side of the "chassis" of the truck is invisible when I rotate the model What can I do ...
8
votes
2answers
1k views

Backfaces give strange results with Fresnel Node in Cycles

I'm trying out a fairly common material setup, mixing a diffuse and a glossy shader with a fresnel node. My issue is that my material has some backfaces owing to its construction. They render ...
8
votes
3answers
36k views

How to properly use face smooth shading

When I select multiple faces in edit mode and use Ctrl+F > Shade Smooth it smoothes the normals with all surrounding faces, regardless of whether they are smooth shaded or not. Using a cylinder for ...
8
votes
2answers
734 views

What are face normals?

I've seen the term Normal being used in many places, but I'm not quite sure what it is or what it's used for; what exactly are they?
8
votes
2answers
1k views

Procedural random/different colors based on normal direction

What I have. A simple subdivided Cube with circular holes in it - every side, six of 'em. Holes have they own material, and each of the hole has different color. Holes are completely flat. I have ...
8
votes
1answer
784 views

Is there a way to render to PNG as raw pixels / without converting color space to sRGB?

Sorry if this was asked before, I did find similar threads on other websites with a workaround, but it would be great if there was a way to do this without having to go through photoshop. What I need:...
8
votes
1answer
7k views

Messed up Blender models when exporting to Unity3D

I have modeled a simple pocket watch in Blender. Every time I import it into Unity3D, regardless of whether I export it from Blender as an FBX or 3ds file, it always comes out missing faces! Why is ...
8
votes
1answer
1k views

How do I stop vertex normals getting overwritten when I enter edit mode?

I'm trying to make a script to apply vertex normals based on selected faces. So far I have written the script and it works fine, but if I exit edit mode and then re-enter edit mode, the normals get ...
7
votes
2answers
4k views

How to 'weaken' or 'strengthen' a normal map texture?

I would like to export a normal map texture itself, what is a correct way to make it stronger or weaker? I found that weakening effect can be accomplished by mixing texture with #8080ff color using <...
7
votes
2answers
2k views

Baked normal map from high poly bad corners

I'm trying to bake a normal map from a high polygon model to a low polygon one. It's a very simple domino shape. When I use the normal on the blender render, I get this strange shape at the border of ...
7
votes
2answers
2k views

How can I fix the non-stitched seam that is present after applying mirror modifier?

I've followed the same tutorial I mentioned in the question I asked yesterday and my boat hull looks pretty good. The process is to make 3D B-Splines increase the resolution and then convert them to ...
7
votes
4answers
519 views

Flatten shading on cylinder

This image shows two of the same curve, one beveled into a cylinder, and one extruded into a flat plane. The material is a Diffuse mixed with glossy at .1 fac. The top cylinder gets a strong ...
7
votes
1answer
4k views

Strange black shading. Cannot fully light mesh. (Cycles)

Here is the viewport in material view. The node setup is just a PNG texture into a diffuse shader. And this is in rendered view. I've tried using environmental lighting as well as a directional ...
7
votes
1answer
6k views

Render entire scene normals

I'd like to render a normal map for an entire scene (for a large background for an isometric game). I tried exporting the "Normal" pass of my render layer, but it's not quite right. Here's what I get ...
7
votes
2answers
1k views

How to keep the vertex normals after deleting an edge/face?

When replacing sparse quads with a custom mesh, I create a "base vertex" on each quad, in order to cause a Particle Instance modifier to spawn the custom mesh at the right place (like for spawning ...
7
votes
2answers
611 views

Is it possible to manipulate normals explicitly in Blender?

Like the question says, can I manipulate normals explicitly? The reason I'm asking is because I'm making a game and I want to make some objects that fit together with other objects as they are placed ...
6
votes
1answer
731 views

Why do normal map ridges become grooves in mirrored object?

My model has a pair of objects, one a mirror image of the other, like bookends or a pair of wheels. They use the same cycles nodes material involving a normal map. Ridges on the one object appear as ...
6
votes
1answer
1k views

Can't render an inside-out cube?

I have "double-sided" unchecked/disabled, but the backs of my faces still render anyway. I should be able to create a cube, flip normals, and render an inside out cube but it doesn't. How can I make ...
6
votes
1answer
1k views

Cycle Normal Pass in Camera Space

I am wondering if there is any way that we can alter the cycle normal pass to output value in camera space. Currently, as far as I know, the normal is in object/world space, which does not change when ...
6
votes
1answer
2k views

What is “Set normals from faces”?

If you are in the mesh Edit mode, you can find a button called Set normals from faces in the Tool Shelf, Shading tab, Normals section. The Blender manual seems to have no information about this ...
6
votes
1answer
3k views

How to unify face and vertex normals

I created a model in another program, and imported it to Blender to map the UVs. Parts of the model are symmetrically flipped mesh planes. I noticed in Blender that the mirrored objects display as ...
6
votes
2answers
2k views

Blender Cycles normal map difficulty

I am having an immense issue with using my normal map in blender cycles engine. It works perfectly fine in Blender Render (but I can't get my transparency to work there, so I figured it's time to move ...
5
votes
2answers
4k views

Display values of a normal of a selected face

We want to see the three values of a normal of a face when we select it in edit mode. How to do so? Is there any add-on showing these sort of info realtime? Update: It seems the accepted answer ...
5
votes
3answers
18k views

What is the role of Auto-smooth?

I have noticed this: the "Auto-smooth" I can't figure out what is its' meaning. I understand that i can use it combing with the smooth shading. For example: A) FLAT B) SMOOTH C) SMOOTH & ...
5
votes
1answer
482 views

In the latest 2.79 daily build, is it possible to convert the Bevel node's RGB normal maps to BW edge highlighters?

On the left is the normal map generated by the Bevel node. On the right is an unbeveled cube with the Bevel node in action. I wish to convert this to a BW map where The edges/gradients are highlighted ...
5
votes
1answer
2k views

Normal map baking - All clean blue (no color variation)

I'm trying to bake a normal map from a high poly mesh, and apply on a low poly mesh (in Unreal Engine 4). Bare with me as I'm new to Blender, and especially new to normal map baking with Blender. I'm ...
5
votes
2answers
737 views

Why OBJ export writes face normals instead of vertex normals

I am confused by the content of OBJ Blender exports. When I export a (default) cube object (8 vertices, 6 faces) to OBJ and then inspect the OBJ file, the "vn" entries obviously correspond to face ...
5
votes
1answer
7k views

Hide back faces in 3D View?

How do you hide back faces so that you only see faces when its normal is facing the camera? When exporting it for use in a game, the face is rendered in only the direction of its normal, so this would ...

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