The tag has no wiki summary.

learn more… | top users | synonyms

13
votes
1answer
795 views

Normals vs Normal maps

I am using Assimp asset importer (http://assimp.sourceforge.net/lib_html/index.html) to parse 3d models. So far, I've simply pulled out the normal vectors which are defined for each vertex in my ...
10
votes
2answers
1k views

Blender - baking normal map - weird colors

I have a metal drum mesh, and when I bake its normal map, I get the weird colors (see attached pic). I'm talking about the horizontal gradient shift of color. There's no deformation like that on my ...
9
votes
4answers
863 views

How does normal mapping really work?

I'm trying to grasp the concept of normal mapping, but I'm confused by a few things. In short, I'm not sure whether a normal map is viewpoint dependent or not (i.e. whether you'll get a different ...
9
votes
2answers
645 views

Why aren't tangent space normal maps completely blue?

Why aren't normal maps just blue? I would think that normal maps should be predominantly blue in color because the Z component of the normal is represented by blue. Normals point out of the surface in ...
9
votes
1answer
323 views

Deferred decals normal problem

I've been working on a deferred decal system. So far I have finished the projection part, meaning I can click something in the scene and it will properly project a decal onto the surface of the ...
6
votes
3answers
725 views

For normal mapping, why can we not simply add the tangent normal to the surface normal?

I am looking at implementing bump mapping (which in all implementations I have seen is really normal mapping), and so far all I have read says that to do this, we create a matrix to convert from ...
5
votes
4answers
377 views

Where can I find free or buy “next-gen” 3D Assets? [closed]

Usually I buy 3D Assets from sites like turbosquid.com or similar. My problem is that I have lately implemented glow, normal maps, specular (and specular power) maps and reflection maps and I can't ...
5
votes
1answer
1k views

How to do simple bump mapping

I'm trying to do bump mapping, and I'm getting fairly close at achieving my goal. I miss one crucial piece of my puzzle to have bump mapped effect in my scene; I need to transform the normals from my ...
4
votes
5answers
482 views

Why don't we use the whole color depth for normal maps?

All normal maps I've seen are pinkish or bluish. So it seems like only a short color range is used. Why do game developers give away so much precision? Update: The short answer is, that technically, ...
4
votes
1answer
390 views

Understanding normal maps on terrain

I'm having trouble understanding some of the math behind normal map textures even though I've got it to work using borrowed code, I want to understand it. I have a terrain based on a heightmap. I'm ...
4
votes
2answers
1k views

XNA 4.0 - Normal mapping shader - strange texture artifacts

I recently started using custom shader. Shader can do diffuse and specular lighting and normal mapping. But normal mapping is causing really ugly artifacts (some sort of pixeling noise) for textures ...
3
votes
1answer
1k views

Deferred Rendering and Normal Mapping

I'm working on a deferred renderer and need a bit of help getting normal maps working. What I've been doing with them so far is just multiplying the normal texture with the object normals ...
3
votes
2answers
364 views

How can I make orange/lemon skin normal map?

What would be the easiest way to make a bump map of the dimples on a citrus fruit such as an orange or lemon in gimp/photoshop without using pictures of it? e.g:
3
votes
2answers
584 views

Trying to understand relatively simple normal map antialiasing paper

See this paper: ftp://download.nvidia.com/developer/Papers/Mipmapping_Normal_Maps.pdf They describe the very simple implementation of an algorithm for antialiasing normal maps. I don't understand ...
3
votes
1answer
406 views

Complex shading using one single (small) texture

Recently I stumbled upon a demo reel in UDK about how one can attain beautiful results using just one (rather tiny) texture that's being sent to the shader pipeline. The famous link is this one. ...
3
votes
1answer
49 views

Calculating normals after displacement mapping

I'm using C++, DX11 and tessellation. After tessellating a triangle I apply displacement mapping to the new vertices. But they still have the original triangle's normal so the lighting calculation ...
2
votes
2answers
228 views

A little bit confused on how to set normals in this case

I'm learning how to use VBOs and I'm following up on the tutorial at the bottom of this page. So I went ahead and created a structure Vertex to hold vertex data.(coordinates and normals). struct ...
2
votes
1answer
367 views

TBN Matrix : Eye vs. World Space Conflict

I am tired of misleading and insufficient articles making me more confused each time I read, I need a clarification that will solve my TBN matrix problem forever. Each article I read informs me ...
2
votes
0answers
314 views

Normal maps in 3dsMax - OgreMax - how to view associated tangent vectors?

Reading this post I found out that 3dsMax might not use the same tangents when rendering normal mapped objects. In my case, I was using Ogre and OgreMax to analyze results and they were very ...
2
votes
0answers
683 views

How can I use the dualforward parameter in my unity shader to use lightmaps and normal maps together? [closed]

I'm using the free version of unity and I would like to combine lightmaps with specularity and normal maps. After doing a -bunch- of research, I've figured out that there doesn't seem to be any easy ...
1
vote
2answers
196 views

Why are normal maps in tangent space but not in normal space?

I want to implement normal mapping in my little game engine. When getting into normal mapping, I wonder why normal maps are typically in tangent space but not in normal space? That normal maps in ...
1
vote
1answer
551 views

Sampling from Normal Map and Diffuse Map in Pixel Shader

I'm having some issue changing a basic lighting shader to take a normal texture and a diffuse texture for a model and then using the normal texture for lighting. The code is very simple and i can't ...
1
vote
1answer
53 views

Normal map causing certain faces to get shaded

I added a normal map to a MR arch & design material in Max 2012. I have a specular in the reflection color slot and a diffuse in the diffuse slot. As i increase the intensity of the normal map i ...
1
vote
2answers
213 views

Texturize a shape of multiple triangles in 2D

This is an example of a shape consisting of multiple points, triangles and eventually a shape: Red Dots = Vector3 (X, Y, Z) or Vector2 (X, Y) If I have a Texture of a certain size, how do I ...
1
vote
2answers
162 views

Tangent on generated sphere

I have difficulties understanding the tangent/bitangent concept for normal mapping, or rather the calculations of them. I draw a sphere which is generated with the code in the OpenGL redbook ...
1
vote
1answer
75 views

OSX Based Equivalents for Stacking Normal Maps?

I've been looking for an OSX based alternative to the Windows based xNormal and NVIDIA textures tools for stacking normal maps in photoshop. Can anyone recommend something, whether it's a standalone ...
1
vote
1answer
44 views

Sampling Heightmap Edges for Normal map

I use a Sobel filter to generate normal maps from procedural height maps. The heightmaps are 258x258 pixels. I scale my texture coordinates like so: texCoord = (texCoord * (256/258)) + (1/258) Yet ...
1
vote
1answer
67 views

Blinn, Normal maps & Fresnel?

So something came up today when I was going over my Blinn shader. As I've been taught, the half-angle vector is calculated in the fragment shader, and is equal to normalize(lightDir + viewDir). This ...
1
vote
0answers
67 views

Normal mapping does not work correctly using GLSL and OpenGL

Hello I wrote a simple OpenGl program using GLSL to render a simple uv mapped plane using the normal mapping technics. Here's the display with a simple phong shading (without normal mapping) : Now ...
1
vote
0answers
77 views

Terrain High-Resolution Normal Map Question

I have a quick question regarding something that has been confusing me for a while. How does terrain as seen from a far distance in these videos: http://www.youtube.com/watch?v=uOEYMhqjMUg and ...
1
vote
0answers
370 views

Texture artifacts and GLSL bump mapping

I'm working on a 3d terrain. I tried out some existing GLSL implementations for bump mapping using normal maps from a Procedural Infinite 3D Cave Generation tutorial. The actual code that I used is ...
0
votes
2answers
223 views

Normal maps red in OpenGL?

I am using Assimp to import 3d models, and FreeImage to parse textures. The problem I am having is that the normal maps are actually red rather than blue when I try to render them as normal diffuse ...
0
votes
2answers
171 views

Normal map applied as diffuse textures looks wrong

Diffuse textures works fine, but I am having problem with normal maps, so I thought I'd tried to apply the normal maps as the diffuse map in my fragment shader so I could see everything is OK. I ...
0
votes
1answer
95 views

Normal Map Issues

I'm experiencing a very strange result in my very simple normal map implementation on iOS 7 - OpenGL ES 2.0. I'm only using the bare parameters necessary and I'm also skipping on all the tangent and ...
0
votes
0answers
16 views

How to generate Normal Maps from Lighting Profiles?

How might I go about generating a normal map from a lighting profile(light map)? I saw "Sprite Lamp" however, if possible, if there is some sort of math I can do myself to convert a lighting profile ...
0
votes
0answers
85 views

Normal mapping and translation, lighting not displaying correctly

I got a normal mapping issue. I have a texture and a normal texture on each model loaded via the ASSIMP library. I am calculating the tangent vectors on each object with the help of the ASSIMP ...
0
votes
0answers
952 views

Normal mapping for Android and iOS

I'm making a mobile game for Android and iOS on Unity. At the moment I am researching and designing the technical aspects of the game. Since it is not plausible to use highly detailed models for ...