Tagged Questions
The projection tag has no wiki summary.
3
votes
2answers
107 views
What's a pre-multiplied 4x4 matrix?
I'm using a 3d game engine, that uses a 4x4 matrix to modify the camera projection.
The matrix is in the regular 4x4 format:
r r r x
r r r y
r r r z
- - - zoom
The description for the ...
1
vote
1answer
126 views
How to calculate FOV with four-walled tiles?
I'm working on a 2D tile-based game. I'm trying to calculate FOV and I've implemented walls so they don't take up an entire tile. Instead, they just take up a side of each tile. Similar to:
class ...
4
votes
3answers
98 views
How can I calculate where my camera can be to avoid showing something outside a region?
I have a landscape model, which goes from the coordinate -45, -45 to 90, 90.
The edge of the model just cuts off and i would like to somehow stop the screen from ever passing these points. Basically ...
2
votes
1answer
70 views
Shader issues when creating projection using CreateOrthographicOffCenter instead of CreateOrthographic
Pre. Having these matrix transformations:
var scale = Matrix.CreateScale(50f);
var eye = new Vector3(0, 0, 10.0f);
var view = Matrix.CreateLookAt(eye, Vector3.Zero, Vector3.Up);
var projection = ...
1
vote
2answers
176 views
Can a 4x4 matrix describe a camera's perspective?
I'm working with a closed-source 3D engine, and it only allows you to set the view projection via a 4x4 matrix. Can this matrix describe the camera's translation, rotation & perspective?
I turned ...
2
votes
1answer
180 views
How to create projection/view matrix for hole in the monitor effect
Lets say I have my XNA app window that is sized at 640 x 480 pixels. Now lets say I have a cube model with its poly's facing in to make a room. This cube is sized 640 units wide by 480 units high by ...
2
votes
2answers
261 views
How should I calculate world and projection matrices in this scenario?
I'm trying to understand transformation matrices. Suppose I use the camera from this StackOverflow answer, this is how my view matrix would look:
Matrix.Identity *
...
13
votes
3answers
632 views
Faking isometric graphics in a 2D space game
First off, I know exactly what my drawing problem is, and I have various ideas on how to approach solving it. I am here to figure out how to adjust which frame is drawn so that the isometric ...
7
votes
1answer
176 views
Projected trajectory of a vehicle?
In the game I am developing, I have to calculate if my vehicle (1) which in the example is travelling north with a speed V, can reach its target (2). The example depict the problem from atop:
There ...
8
votes
3answers
603 views
What is the name of perspective of Age of Empires II?
One would describe Age of Empires 1's "perspective" as a 2D sprite game (screenshot).
Below is a screenshot of Age of Empires II. How would you describe the "perspective"? Is it also a 2D sprite ...
0
votes
0answers
244 views
Setting up perspective projection on Opengl ES 2.0 makes objects disappear
I'm working on a project using opengl-es 2.0, and I'm having some trouble setting up perspective projection.
If I don't set up the perspective projection and simply multiply the object-to-world ...
7
votes
1answer
162 views
Downprojecting an imaginary 4D mesh to the screen
As a mental exercise, I'm trying to imagine projecting an arbitrary 4D mesh onto the screen (2D).
I'm guessing a single 4D triangle would still consist of only 3 points, however each of those 3 ...
7
votes
5answers
597 views
Do I need the 'w' component in my Vector class?
Assume you're writing matrix code that handles rotation, translation etc for 3d space.
Now the transformation matrices have to be 4x4 to fit the translation component in.
However, you don't actually ...
0
votes
0answers
131 views
Dynamic enviroment map using pincushion Curvilinear Perspective Projection possible?
I'm wondering if it is possible to generate a dynamic spherical environment map using a single frame render using a pincushion Curvilinear Perspective Projection Matrix (phew that's a mouthful).
...
3
votes
2answers
321 views
XNA - Non perspective projection?
For a section of my game, instead of having a perspective projection, i would like to display an isometric view of an object.
So i don't want things to appear smaller if in a distance, etc.
...
