Tagged Questions
1
vote
1answer
54 views
Sprite rotation
I'm using OpenGL and people suggest using glRotate for sprite rotation, but I find that strange. My problem with it is that it rotates the whole matrix, which sort of screws up all my collision ...
0
votes
1answer
89 views
How to draw a rotatable and zoomable sphere?
My game is a sort of business simulation game of Earth, and I want the main interface to be just like a google earth view. Is there a way to do this with built in OpenGL features or do I have to ...
0
votes
0answers
55 views
OpenTK (OpenGL) Rotation around fixed axes?
How would I go about rotating things in 3-dimensional space along fixed axes? As OpenTK only seems to have rotation that modifies the other rotation, as in
X affects Y & Z
Y affects Z
Z affects ...
0
votes
2answers
97 views
get the new vertices after rotating in JOGL
I had rotate an object with openGL (JOGL).
Is there a simply way how I can get the new vertices?
1
vote
0answers
50 views
Rotate view matrix based on touch coordinates
I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing ...
2
votes
1answer
179 views
Problem using glm::lookat
I am trying to rotate a sprite so it is always facing a 3D camera.
Object
GLfloat vertexData[] = {
// X Y Z U V
0.0f, 0.8f, 0.0f, 0.5f, 1.0f,
-0.8f,-0.8f, 0.0f, ...
0
votes
2answers
110 views
Is this Rotation Matrix correct?
I'm having heavly troubles with setting up a View Matrix and a Projection Matrix. It simply doesnt work. So I think my problem is related to my rotationMatrix function. I'm using this tutorial to ...
1
vote
2answers
534 views
Render rotated rectangle inside other rectangle bounds using Libgdx
I have this code to generate a red rectangle inside a grey rectangle:
new Rectangle(grey_rectangle_position_x, Game.SCREEN_HEIGHT/2-Rectangle.height/2,0);
This code makes the following:
Now, I ...
1
vote
1answer
257 views
How do I apply 2 rotations about different points to a single primitive using OpenGL
I'm working on a 2D top-down shooter game that has a rotation feature like Realm Of The Mad God such that if you press e the camera rotates around the character in a clockwise direction and q rotates ...
0
votes
1answer
939 views
Rotating Objects in OpenGL: glRotate or Quaternions?
I'm coding my first engine and I'm trying to have performance in mind since I'll probably use it for mobiles, and I have this question, should you use glRotate or Quaternions for rotating objects in ...
0
votes
1answer
178 views
rotate sphere horizontally around another sphere
I currently have an earth and a moon. What I'm trying to achieve is to have the moon physically rotate around the earth horizontally along the equator along a circular path.
moonAngle = ...
3
votes
2answers
506 views
How is the gimbal locked problem solved using accumulative matrix transformations
I am reading the online "Learning Modern 3D Graphics Programming" book by Jason L. McKesson
As of now, I am up to the gimbal lock problem and how to solve it using quaternions.
However right here, ...
1
vote
2answers
1k views
Rotating a Quad around it center
How can you rotate a quad around its center?
This is what im trying to do but it aint working:
GL11.glTranslatef(x-getWidth()/2, y-getHeight()/2, 0);
GL11.glRotatef(30, 0.0f, 0.0f, ...
4
votes
2answers
727 views
How to rotate camera centered around the camera's position?
Currently I am using gluLook at like so:
gluLookAt(position.x, position.y, position.z,
viewPoint.x, viewPoint.y, viewPoint.z,
upVector.x, upVector.y, upVector.z);
with the ...
1
vote
2answers
679 views
Rotating 2D Object
Well I am trying to learn openGL and want to make a triangle move one unit (0.1) everytime I press one of the keyboard arrows. However i want the triangle to turn first pointing the direction where i ...
