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0answers
18 views

Clamping in clip space

I'm trying to implement portal culling algorithm. And atm I'm stuck with clip space. What I do atm is bringing portal vertexes into clip space with frustum and view matrix of camera. Then I check ...
0
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3answers
48 views

Velocity Relative To A Vector

So I have a velocity vector b in world space and I have a "pointing" vector a in world space. I need to know how to make the velocity vector to be relative to the "pointing" vector. Better explanation ...
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1answer
86 views

Should I store local forward/right/up vector or calculate when necessary?

I'm working on an object picking and translation/rotation/scale gizmos system in my engine where you select objects and perform transformations on them in a 3d editor-like fashion (e.g. Blender) In ...
3
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1answer
65 views

Tangent space - Lengyel vs ShaderX5 - difference

I have been studiing tangent space calculations and came across two solutions E. Lengyel - http://www.terathon.com/code/tangent.html ShaderX5 solution - (solution is also desribed here http://www....
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1answer
51 views

Space of Tangent and Bitangent Vectors

I have a really simple question I cannot be sure about the answer. What is the space of tangent (T), and bitangent (B) vectors when we calculate them using vertex positions, and texture coordinates?
3
votes
1answer
93 views

Placing an AABB close to a point so that it doesn't intersect any other AABBs

Give a 2D space with a bunch of non-intersecting AABBs, and a point in this space (that may or may not be inside an AABB), how can I find the closest place where I can place a new AABB of a given size?...
3
votes
1answer
365 views

What are the advantages of tangent space shading/lighting, and what about attenuation?

In several topics here it was suggested by people that doing lighting in tangent space is better than doing it in world space. Right now I am doing it in camera space, but it's really similar to world ...
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2answers
200 views

Why do we say things are rotated around the z-axis in a space graph?

I've embarked on a journey of game development. I need to learn lots of 3D terminology, since I want to make 3D games. I learned that X is to the right, Y is up, and Z is towards you. Then why when a ...
2
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1answer
107 views

Space between randomly generated objects

Im not sure there is a going to be a simple answer for this question but Ill ask anyway. I am programming an endless scrolling game where the player's character is constantly "falling." As they fall ...
5
votes
1answer
1k views

Why is clip space always referred to as “homogeneous clip space”?

I've noticed in almost everything I've read so far that the term "clip space" is prepended with the word "homogeneous". Now I understand that it roughly means "all the same", but I don't understand ...
8
votes
1answer
2k views

what is world space and eye space in game development?

I'm reading a book about 3D stuff and OpenGL. The book often talks about world space and eye space. What exactly is the "world space?" Does the "eye space" mean the projection?
4
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2answers
2k views

Rendering artifacts at a large scale

I'm a new to OpenGL or graphics in general. Trying to write a game with realistic scale. I had a perfectly fine rendering of earth at a small scale, but when I try to scale it up to 1:1 I get this ...
1
vote
2answers
295 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 ...
2
votes
2answers
872 views

World space and model space the dummies version [closed]

I'm by no means a 3d programmer but have recently taken it upon myself to build a Voxel based game and I'm having a little trouble understanding some of the concepts around matrices (what with my ...
3
votes
1answer
3k views

global transform to local transform?

If an object is attached to another one and you need to set its position, rotation and scale in global space, what do you do to get the local versions of these values, knowing the same values for the "...
1
vote
4answers
227 views

Space & Sound? Defying Physics?

Why are there sound effects in space shooter games like asteroid and such? There is no medium in space for sound to travel by. Yet we get hear gun shots & explosion. I am not talking about the ...
0
votes
1answer
114 views

How to shoot a triangle out of an asteroid which floats all of the way up to the screen?

I currently have an asteroid texture loaded as my "test player" for the game I'm writing. What I'm trying to figure out how to do is get a triangle to shoot from the center of the asteroid, and keep ...
23
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5answers
4k views

Are there any disadvantages of using Distance Squared checks rather than Distance?

I use distance squared checks for basically all my distance (vector3 length) checking, due to the performance increase from not incurring a square root (like in plain length checks). From the looks ...
3
votes
1answer
825 views

COLLADA: Inverse bind pose in the wrong space?

(Crosspost from StackOverflow) I'm working on writing my own COLLADA importer. I've gotten pretty far, loading meshes and materials and such. But I've hit a snag on animation, specifically: joint ...