Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>From the POV of the terrain, yes, the camera is rotating. But, since your view is from the POV of the camera, when you rotate the camera, it appears that the terrain is rotating. This is the behavior that <a href="http://www.opengl.org/resources/faq/technical/viewing.htm" rel="nofollow noreferrer">gluLookAt()</a> is intended to produce. If there is something else that you expected, you will need to rotate only the geometry that you want rotated, and not try to rotate using gluLookAt().</p> <p>Update 1: Based on the discussion below, try this:</p> <pre><code>void Camera::RotateCamera(float h, float v) { hRadians += h; vRadians += v; cam_norm.x = cos(vRadians) * sin(hRadians); cam_norm.y = -sin(vRadians); cam_norm.z = cos(vRadians) * sin(hRadians); cam_up.x = sin(vRadians) * sin(hRadians); cam_up.y = cos(vRadians); cam_up.z = sin(vRadians) * cos(hRadians); } void Camera::Place() { //position, camera target, up vector gluLookAt(cam_pos.x, cam_pos.y, cam_pos.z, cam_pos.x+cam_norm.x, cam+pos.y+cam_norm.y, camp_pos.z+cam_norm.z, cam_up.x, cam_up.y, cam_up.z); } </code></pre> <p>Separating the camera normal (the direction the camera is looking) from the position allows you to independently change the position, pan and tilt... that is, you can change the position without having to recompute the normal and up vectors.</p> <p>Disclaimer: This is untested, just what I could do on the back of a sheet of paper. It assumes a right handed coordinate system and that pan rotation is applied before tilt.</p> <p>Update 2: Derived using linear algebra rather than geometry... again, untested, but I have more confidence in this.</p>
    singulars
    1. This table or related slice is empty.
    1. POCamera rotation (OpenGL)
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USandand
    1. USandand
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCamera rotation (OpenGL)
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI thought that it was supposed to give a "panning" shot with the camera in one position, not orbiting around the target. How do I go about doing this?
      singulars
      1. PO
      1. USpaintstripper
    2. COOkay, I see what you're saying now. Assuming there are no other transformations on the terrain, and you are orbiting around the terrain, then your camera position is changing. Look in your code for places where your camera position is changing or where there are other transformations that could be moving the terrain. Your call to gluLookAt() appears to be correct, given what you have posted.
      singulars
      1. PO
      1. USandand
    3. CO@paintstripper: One other thing, the way I typically use gluLookAt() for a camera class is to give it a position (X, Y, Z) and an orientation (Y, P, R) (for yaw, pitch and roll, though you could use Rx, Ry, and Rz for rotation about X, Y, and Z respectively). I then apply the respective rotations for the normal vector (0, 0, 1) and the up vector (0, 1, 0). Again, I don't see anything intrinsicly wrong with the way you've done it, though I could use a better understanding of your thoughts for computing cam_up.y.
      singulars
      1. PO
      1. USandand
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload