Tagged Questions
0
votes
0answers
100 views
Why my camera sees what is behind it?
I am building a minimal opengl viewer and I am puzzled by what I see : the camera see the (test) object that is behind her. the front and back of the camera looks reverted.
I am wondering what could ...
0
votes
1answer
107 views
switching from third person view to first person view
I have done a scene in opengl where I'm using a third person camera (that I can control with the mouse). Then, inside it, it has the camera of the first view (that I called thirdpersonCamera, see the ...
1
vote
2answers
133 views
Replace glTranslatef and glRotatef with matrixes
I'm not an opengl expert, and, as a novice, I prefer to practice a little bit with the old opengl just to be sure to understand correctly the basic concept of computer graphics before deal with ...
1
vote
1answer
124 views
Combining rotation,scaling around a pivot with translation into a matrix
In short: I need to combine rotation (in the form of a quaternion), scaling around a pivot point along with translation into a transformation matrix.
The long:
I am trying to implement a proprietary ...
1
vote
0answers
74 views
Matrix array doesn't seem to get populated
I'm trying to stream an array of matrices to a vertex shader, but it seems that only the first matrix works. What could be the problem? I suspect that I upload the matrices in a wrong way.
C#
...
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 ...
1
vote
1answer
117 views
How to do directional per fragment lighting in world space?
I am attempting to create a GLSL shader for simple, per-fragment directional light. So far, after following many tutorials, I have continually ran into the issue: my light is specified in world ...
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 ...
2
votes
1answer
74 views
Manual GLU.gluUnproject
Before I used GLU.gluUnproject to calculate my picking ray in my OpenGL game. Recently I switched to my own calculated matrices, and now I can forget the gluUnproject.
How can I calculate the picking ...
0
votes
2answers
450 views
OpenGL - Understanding the relationship between Model, View and World Matrix
I am having a bit of trouble understanding how these matrixes work and how to set them up in relation to one another to get a proper system running.
In my understanding the Model Matrix is the matrix ...
2
votes
1answer
106 views
OpenGL Calculate Matrices
Im trying to switch from the glTranslate etc to my own Matrices, but for some reason it does not work. Here are my 2 functions to create the view- and projection matrix:
public Matrix4f ...
2
votes
1answer
90 views
Translating Viewmatrix is inverted, why?
So I've defined a Projectionmatrix, Viewmatrix and a Modelmatrix using OpenGL (LWJGL).
But when I translate my Viewmatrix to +X it moves my object to the right (hence my camera is moving to the ...
2
votes
0answers
111 views
Box2D, OpenGL, resolution and matrix setup
Okay, my internal units are going to be meters, ranging between 0.1 and 10 meters for size.
First of all, my mind is all wrapped up in a knot trying to understand how to handle my game with multiple ...
2
votes
1answer
124 views
Camera not strafing (GLSL)
I use this code in my GLSL vertex shader, where v_position is the vertex position:
gl_Position = v_position * u_camera;
and set u_camera as follows:
meshShader.setUniformMatrix("u_camera",
...
0
votes
1answer
134 views
Box2D OpenGL debug renderer convert box2d coordinates to world space
I made an OpenGL 3.x renderer for Box2D's debug draw (b2Draw base class). Unfortunately I've tried for a while now to convert the box2D units, which are meters to my internal units which are pixels. I ...
