An array of numbers, symbols or expressions, arranged in row and columns. The numbers, symbols or expressions themselves are called elements or entries.
9
votes
2answers
2k views
How can I rotate about an arbitrary point in 3D (instead of the origin)?
I have some models that I want to rotate using quaternions in the normal manner, except instead of rotation about the origin, I want it to be offset slightly. I know that you don't say, in 3d space, ...
4
votes
2answers
801 views
Matrix for 2D perspective
I'm trying to determine whether what I'm attempting to achieve is even possible mathematically. I'm obviously not a seasoned game developer so I'm having trouble even coming up with the terminology to ...
3
votes
1answer
1k views
Moving a rotated model in XNA
This seems like a simple problem with an equally simple solution that is invisible to me.
I have a model that spawns at the origin and looks at my player model wherever it goes.
I would like it to ...
2
votes
1answer
138 views
How attach a model with another model on a specific bone?
I meet a difficulty attached to a model to another model on a "bone" accurate.
I searched several forums but no result. I saw that many people have asked the same question but no real result see no ...
1
vote
3answers
211 views
Inverting matrix then decomposing gives different quaternion than decomposing then inverting the quat
I'm getting different signs when I convert a matrix to quaternion and invert that, versus when I invert a matrix and then get the quaternion from it:
Quaternion a = Quaternion.Invert(getRotation(m));
...
1
vote
4answers
3k views
Transform coordinates from 3d to 2d without matrix or built in methods
Not to long ago i started to create a small 3D engine in javascript to combine this with an html5 canvas.
One of the issues I run into is how can you transform 3d to 2d coords.
Since I cannot use ...
40
votes
7answers
5k views
Why do we move the world instead of the camera?
I heard that in an OpenGL game what we do to let the player move is not to move the camera but to move the whole world around.
For example here is an extract of this tutorial: OpenGL View matrix
...
8
votes
4answers
889 views
Staggered Isometric Map: Calculate map coordinates for point on screen
I know there are already a lot of resources about this, but I haven't found one that matches my coordinate system and I'm having massive trouble adjusting any of those solutions to my needs.
What I ...
11
votes
6answers
3k views
Math topics for 3D graphics programming
I understand that the following math topics are required for 3D graphics programming. I have started doing some of them in my math course. Can someone point me in the direction of a resource that ...
4
votes
2answers
777 views
Should the modelview and projection matrices be calculated in the shader or on the CPU?
At minimum I would have a camera with rotation and world position; projections parameters such as angle of view and perspective vs. orthographic; and meshes with scale, angle, and world position.
...
6
votes
1answer
229 views
How can I attach a model to the bone of another model?
I am trying to attach one animated model to one of the bones of another animated model in an XNA game.
I've found a few questions/forum posts/articles online which explain how to attach a weapon ...
2
votes
2answers
937 views
XNA Camera 2D confusion
I have followed the tutorial at http://www.david-amador.com/2009/10/xna-camera-2d-with-zoom-and-rotation/ to implement my 2D camera and everything works just fine. However this leaves me confused. ...
1
vote
1answer
315 views
importing animations in Blender, weird rotations/locations
This is for the Blender 2.6 API.
There are two problems:
1. When I import a single animation frame from my animation file to Blender, all bones look fine.
But when I import multiple (all of the ...
1
vote
2answers
578 views
Transformation order when dealing with Meshes
I have created a player model out of primitive types. To do this I have created a Model class and Component (mesh) class. Each model consists of one or more components my problems start when you have ...
10
votes
5answers
539 views
Is there a common word that encompasses handling of position, rotation, and scale together?
I'm looking for a name for my class that manipulates 4x4 matrices that handle position, rotation, and scale. Is there a common word that encompasses all three?
(I'm splitting the matrix math into its ...
