0
votes
0answers
36 views

3D model editor manipulators

I'm trying to make my own 3D model editor to better learn 3D programming. I have my translate manipulators and I'm trying to calculate the Vector2 that the mouse would have to move in order to move an ...
2
votes
1answer
127 views

3D Camera Rotation

Please, forgive me, but I need help and I've been stuck on this for a few weeks now, I'm making no progress and everywhere I go and I see a different answer, everything I try doesn't work. I've had ...
0
votes
1answer
92 views

What are the correct angles in the Top-down perspective?

In the following picture it says that in the Top-down perspective the angles are 90°, but if it would be 90° then you shouldn't see the front of the building and the roof at the same time... So what ...
3
votes
3answers
102 views

Smooth interpolation with variable time steps

My game engine just went through a small overhaul that changed its fixed time step loops into variable time steps ones. Though everything has already been adapted steadily to the new environment, ...
0
votes
2answers
191 views

How to detect collision between a camera and a mesh?

I am wondering how you would be able to extract mesh properties (i.e. faces, vertices, and vertex normals) and use them to create a collidable object, one that a camera can't go through ? I am using ...
2
votes
1answer
205 views

Project collision shapes to plane for 2.5D collision detection

I am working on a top down 2.5D game. In the game anything that overlaps on the screen should be 'colliding' with each other regardless of whether they are on the same plane in the 3D world. This is ...
0
votes
1answer
429 views

Quaternion LookAt for camera

I am using the following code to rotate entities to look at points. glm::vec3 forwardVector = glm::normalize(point - position); float dot = glm::dot(glm::vec3(0.0f, 0.0f, 1.0f), forwardVector); ...
1
vote
1answer
103 views

Automatically zoom out the camera to show all players

I am building a game in XNA that takes place in a rectangular arena. The game is multiplayer and each player may go where they like within the arena. The camera is a perspective camera that looks ...
2
votes
4answers
184 views

How do I rotate a camera around the Y axis of the object it's looking at? [duplicate]

I'm making a camera that can currently rotate freely from the back to the front of a target object by giving it an angle and a distance. I do the above with the following code directionVector = ...
1
vote
2answers
293 views

Rotate around the centre of the screen

I want my camera to rotate around the centre of screen and I'm not sure how to achieve that. I have a rotation in the camera but I'm not sure what its rotating around. (I think it might be rotating ...
1
vote
0answers
84 views

Determining axis to rotate around

I'm trying to implement a free-look third person camera (using glm). I know that the general transformation is newCameraPosition = translate(lookatPoint) * rotation(angle,axis) * ...
0
votes
2answers
78 views

Need transform matrix to translate the center of the view to a custom position within the target texture

My problem is as follows: I want to use a single render target texture for drawing 16 viewports where I want to display the 16 different combinations of the marching squares algorithm with my 3D ...
0
votes
1answer
249 views

Drawing the same scene with perspective then orthographic projections

I have a scene that I'm rendering first with a perspective matrix. I then want to rerender it in a different viewport using an orthographic matrix for a top-down 2D view of the scene. I think I may be ...
1
vote
2answers
172 views

Accumulating rotations for camera

It seems there are three ways to store a camera's rotation: in angles, view matrix or quaternion. I was using euler angles since when I used a matrix it had a tendency to accumulate rounding errors ...
13
votes
1answer
369 views

Orthographic unit translation mismatch on grid (e.g. 64 pixels translates incorrectly)

I am looking for some insight into a small problem with unit translations on a grid. Update and Solved I solved my own issue. See below for details. Everything in this part of the post turned out to ...
1
vote
1answer
184 views

Camera lookAt target changes when rotating parent node

have the following issue.I have a camera with lookAt method which works fine.I have a parent node to which I parent the camera.If I rotate the parent node while keeping the camera lookAt the target , ...
0
votes
2answers
210 views

Determining my playable area/field of view

Contrary to what I found searching for the answer, I'm not trying to see whether a character is in view of another character. What I need to find out is the size of the field of view. This is because ...
3
votes
0answers
188 views

Web sites with famous game information? [closed]

Is there any website containing informations related with some famous game? For information I mean how to calculate damage in a rpg for example, or how they've set camera and other tips like this! ...
0
votes
1answer
981 views

as3 3D camera lookat

I'm making a 3D camera scene in Flash, draw using drawTriangles() and rotated and translated using a Matrix3D. I've got the camera to look after a specific point, but only on the Y-axis, using the x ...
-1
votes
1answer
181 views

Camera not working

I made a camera in DX9. To move forward I press the Up arrow. To rotate on the Y axis I use the mouse. When I perform these movements on their own the camera moves at the speed I want. However, if I ...
4
votes
1answer
1k views

Orthographic Camera Zooming

In XNA I am using a spritebatch to render a board. I have created a camera class which can provide me a view and projection matrix. Currently I am supplying the view matrix to my sprite batch when I ...
2
votes
2answers
875 views

How to rotate an object so it stands correctly (back always facing the camera)

I have the following scene: And I have two 3D vectors, the camera position, and the focus position. The focus vector is always behind the monster. I know how to rotate the camera around the focus ...
3
votes
2answers
171 views

Camera placement sphere for an always fully visible object

Given an object: With the bounds [x, y, z, width, height, depth] And an orthographic projection [left, right, bottom, top, near, far] I want to determine the radius of a sphere which allows me to ...
1
vote
0answers
146 views

Issues with Spherical Coords and gluLookAt

I am currently developing a game set in a planet(A sphere), in which my camera mostly works though some issues arise from this method: ...
1
vote
1answer
156 views

Averaging Camera Position

I'm making a camera which tracks the player. I am using a basic algorithm to calculate a position for the camera relative to the player. Then I am taking an average of this over the last x number of ...
0
votes
1answer
756 views

Camera Rotation (for mouse look) with LookAt does not work as expected (Local/Global)

My code for rotating my 3D fps camera isn't working as expected. I expect that the X-axis does rotate with the Y-axis, but it ain't so. I made some pictures to explain it better, I think its doing ...
5
votes
2answers
910 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 ...
5
votes
2answers
527 views

Manipulating a free camera

I have a camera class in my code which stores two 4x4 matrices. One for the view matrix and one for the projection matrix. Originally, I had two floats in the class for pitch and yaw and these were ...
1
vote
2answers
490 views

OpenGL Camera causes spatial distortion

I'm trying to implement a 3D camera of the "Orbit around the origin" variety in a game engine I'm developing in order to learn about 3D graphics and game programming. I have a basic handle on the ...
2
votes
1answer
445 views

Calculating camera zoom value (top-down)

I need some help in 'camera maths'. I have a birds eye view of two characters. One character is static and the other can move. I would like the camera to always show both characters in full and, in ...
6
votes
4answers
1k views

Equation for bouncing graph?

I basically want my camera in 3D move automatically. Currently, I have linear movement which is rather dumb, so I'd like to do a bouncing movement. However, what is a good equation for bouncing? I ...