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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34
votes
3answers
56k 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 ...
7
votes
1answer
2k 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 ...
19
votes
4answers
109k 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 ...
24
votes
7answers
21k 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?
14
votes
1answer
10k 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 ...
7
votes
1answer
6k 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 ...
7
votes
2answers
475 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?
4
votes
1answer
624 views

Seeing through objects in Game engine

I used sculpting on a plane, and things looks great. However, when I press P to play, the whole ground become a mess. I can see through it in various places, and there are also nasty looking black ...
13
votes
3answers
24k 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 ...
12
votes
1answer
66k 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
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 ...
1
vote
1answer
498 views

How to render depth or surface Normal maps that properly reflect details of 3D shapes while respecting the nature of materials (transparency/glass)?

I am trying to render depth maps and surface Normal maps of different 3D shapes using Cycles. What I care about the most is how much of the details of the 3D shapes are captured in the depth maps or ...
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 ...
10
votes
2answers
9k 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 ...
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 ...
4
votes
2answers
6k views

How to draw normal map?

How can I draw (not bake) normal map over my model, like a texture in texture paint mode? Render cycles. Thank you in advance!
4
votes
1answer
2k views

Dual normal faces

I have created a model which requires some faces to be dual sided. I intend to import this model into Unity. Reading about this, it seems that the recommendation is to duplicate the polygons and then ...
2
votes
1answer
293 views

Acces unmodified Normals on object with Custom/Transferred normals

I have a complex mesh that I am giving custom Normals to via the Data Transfer modifier. The normals are coming from a simpler mesh. I want to use both the original normals and the custom normals in ...
7
votes
2answers
1k 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 ...
3
votes
2answers
3k views

strange lighting, problem with normals?

I'm trying to create a simple human mesh. While working on the torso, I noticed some shading errors. They look even worse when you move the camera around. The one on the left is with shading set to ...
10
votes
3answers
1k 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 ...
3
votes
1answer
27k views

Baking normals from high to low poly mesh for game object

I modeled a high poly gun and uv unwrapped it. I then duplicated the object and removed a whole lot of edge loops to make it lower poly (3500 tris for the high poly gun to 350 tris for the low poly). ...
3
votes
2answers
3k views

Set normal orientation of origin

I want to change the orientation of my object to a specified direction. Say I have an axle of a train whose normal orientation is set off by 90° from the global orientation: The green arrow (Y-axis) ...
2
votes
1answer
1k views

How to correctly drive a normal node with lamp rotation?

I'm trying to use drivers to allow a lamp rotation to dictate the direction of my normal node. The problem seems to be that the sun can rotate from 0-360 degrees, but the driver has a limit of 0-90 ...
4
votes
2answers
3k 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 ...
2
votes
1answer
8k views

After import to Unity, all my normals are flipped

I found someone with similar problem, but their answer doesn't work for me. Other than that, the net is full of advice how to flip normals programmatically to create interiors on the fly, but other ...
1
vote
1answer
3k views

What does it mean when my Angle setting under Auto Smooth greyed out?

I am trying to understand why sometimes my Angle value is greyed out under Auto Smooth in the Data Panel of the Properties Editor. Does anyone have any idea why this happens, what it means and how to ...
4
votes
1answer
1k views

Render has strange artifacts

I've got a problem with my rendering! I'm trying to render some objects: But, this is how it renders: Can somebody help me out?
1
vote
1answer
2k views

Bake Normal space: Camera vs World vs Object vs Tangent

The manual says: Tangent space normal maps are the most common, as they support object transformation and mesh deformations. Object space normal maps keep sticking to the surface under object ...
6
votes
2answers
3k 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 <...
10
votes
3answers
5k 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 ...
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 ...
4
votes
3answers
4k views

Some edges are not shown in object wireframe mode?

The wireframe on the right looks correct, but in object mode on the left, you can see that the upper and lower vertices are not connected, while the "box" to the right is fine. I tried Fill and Merge ...
4
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 ...
4
votes
1answer
5k 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 ...
3
votes
2answers
2k views

How to create normal texture with node setup?

My question is pretty simple. How do I create a normal texture by combining certain nodes with the diffuse texture? This would be really helpful and would save me LOADS of time! Thanks!
5
votes
2answers
11k 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 & ...
4
votes
3answers
811 views

normals changed after separating object in 2 pieces

When having smooth shading on a sphere and separating the top into a separate object the shading is no longer smooth over the 2 parts, there is a discontinuity: It turns out the ...
4
votes
1answer
2k views

Normal map looking weird on mesh

I've been studying more and more about creating normal maps and texturing the mesh. However, I can' t really find a solution for my question in the Internet and I was wondering maybe you could help. ...
3
votes
2answers
854 views

Rendered Texture looks messed up

I could not figure this one out by myself so far, and would appreciate some assistance from you guys. After setting up the base color / albedo and the normal map for my object, it looks fine in 3D ...
3
votes
3answers
1k views

Error extruding loop selection along individual face normals

How do I extrude a face loop selection along face normals? To grasp the problem, take a convex shape such as the back of a satellite dish. If you would like to see in what direction that I would like ...
2
votes
2answers
1k views

Vertex normals incorrect, but face normals look correct?

I recently imported an FBX from a Max export and about 90% of the model looks fine but for some parts, the vertex normals are 'twisted' even though the face normals look correct. As far as I can tell ...
2
votes
1answer
462 views

Is it possible to have a plane with its normal as reference for Transform Orientation

Is it possible to have a plane with its normal as reference for Transform Orientation (Global, Local, Normal, Gimbal, View axis)? For example, I would like to select every face and scale to 0 to the ...
1
vote
2answers
1k views

Select Object and recalculate normals via script

I have a script that import OBJ and export OBJ, but I need to perform some operations in between. For example select the mesh and recalculate the normals for having all outside. How is it possible to ...
1
vote
3answers
519 views

Invisible and black faces after switching from Cycles to Blender render engine

It seems that something about the way I have jumped between Cycles and Blender render has caused issues with a file. I am new to render engines and not that experienced in Blender in general, so I ...
1
vote
1answer
70 views

Does seam itself affect baking?

Hi. I can't bake properly. after countless time of trying I still don't know what causes this though the set up is exactly same as tutorial video. 'white' space just doesn't show up except for the ...
1
vote
1answer
556 views

How to render camera view-invariant surface Normal maps in Blender?

I wonder how I can render camera-view invariant surface Normal maps in Blender (ideally, through Blender's Python API)? Maybe as the first step, can someone explain how one can obtain surface Normals? ...
1
vote
2answers
1k views

Seams on normal map

so I have a arm model, and I baked a normal map for from a sculpt. However, when I apply this normal map in any program (Blender, Unreal, Unity) there are seams on it. (from the UVs). This is ugly and ...
1
vote
1answer
721 views

Conflicting faces rendering as black

In my blend file here, I'm trying to write a shader that uses a gradient to mix between transparency and the surface material. So far, I've managed that. But when transparent, the object shows black ...
1
vote
1answer
381 views

Why does turning off Auto Smooth removes blotches?

Often with imported OBJ meshes I noticed that some seemingly random vertices are surrounded in dark blotches and sometimes adjacent ones are pale. Yet all the readable characteristics are identical to ...