Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <pre><code>GLU.gluLookAt(gl, 0, 0, -5f, 0f, 0f, 0f, 0.0f, 1.0f, 0.0f); </code></pre> <p>Try to change -5f to 0, what you're saying here is displace the camera 5 units back, therefore unless you're doing an orthogonal projection (which I think you're not, try checking out <a href="http://www.opengl.org/sdk/docs/man/xhtml/glOrtho.xml" rel="nofollow">this</a>) what OpenGL is doing is scaling your background polygon according to your perspective view, and you see it as 'smaller'.</p> <p>If you do an orthogonal projection, no matter how much you move your camera in the z axis, you will always see it the same size. This is useful for 2D OpenGL-based games, so do check out the link above.</p> <p>EDIT: gluPerspective and glOrtho</p> <pre><code>gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar); </code></pre> <p>gluPerspective has a parameter called 'fovy', which is basically the 'Field of View in the Y axis'. The field of view expresses the amount of space the camera can see, basically 'expanding' or 'contracting' whatever vertices happen to be before it. A typical human eye has a 45º FOV.</p> <p>The zNear and zFar express the near and far frustum limits, the frustum being an invisible 'box' which determines which vertices are outside the viewing area.</p> <p>Aspect determines the ratio between the width and height of the camera.</p> <p>glOrtho is a special case of gluPerspective in the sense that the FOV is always 0.</p> <pre><code>gl.glOrthof(0.0f, (float) width, (float) height, 0.0f, 1.0f, -1.0f); </code></pre> <p>The first four parameters specify the size of the clipping plane (normally the size of the screen), the other two values specifiy the frustum near and far (which you don't need unless you want to hide objects by placing them 'far away'.</p> <p>I hope this cleared it up a bit for you.</p>
    singulars
    1. This table or related slice is empty.
    1. POandroid/openGL: fill a 2d viewport with a square
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USRedOrav
    1. USRedOrav
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POandroid/openGL: fill a 2d viewport with a square
      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. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COHi there RedOrav. I've been following multiple guides (I've lost track at how many, there's just so many tabs open at the moment) and I'm not quite sure which projection I'm using. What exactly does it mean? (edit: sorry I just did a google search on the meaning of the word and it seems like that's what I need!)
      singulars
      1. PO
      1. UStwig
    2. COA projection is how you transform your 3D coordinates to show on a 2D screen. It's like 'flattening' them so they can show properly, according to some parameters. Normally, 3D apps use a 45 degree angle 'lens' which imitates the eye, but you can use whatever angle you want to distort an image (like using a convex or concave lens in a camera) That said, an orthogonal projection is one in which the camera's z axis is always perpendicular to one of the coordinates in 3D. Therefore you will only see two coordinates, 'flattening' your image completely.
      singulars
      1. PO
      1. USRedOrav
    3. COAh thanks for that. Makes sense. Well, I tried reducing the -5.0f to 0 and it now shows me a blank red screen (red being the clear colour). I also tried replacing glFrustum() with glOrthof() and the same result (for both -5f and 0f) gluLookAt()
      singulars
      1. PO
      1. UStwig
 

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