Databases
StackOverflow2013
Postsdbo
POOpenGL ES no Longer Displaying Object
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POOpenGL ES no Longer Displaying Object
    primarykey
    data
    text
    <p>I am new to OpenGL ES programming. I found a good tutorial to start and the project displayed a square. I then tried to move the most OpenGL code out of the View Controller to a Model object which would store vertices, color, etc and then in the View Controller I would just call:</p> <pre><code>[model update]; [model load]; </code></pre> <p>This way it would be more practice if I had several models to display. And since I did this the cube no longer displays on screen. I think I pinpointed to error to the update method where all the model view matrix calculations occur, because when I comment out this method the cube displays but it just fills the screen.</p> <pre><code>-(void)update: (int)width And:(int)height{ float aspect = (width/height); GLKMatrix4 projectionMatrix = GLKMatrix4MakePerspective( GLKMathDegreesToRadians(65.0f), aspect, 4.0f, 10.0f); self.effect.transform.projectionMatrix = projectionMatrix; GLKMatrix4 modelViewMatrix = GLKMatrix4MakeTranslation(0.0f, 0.0f, 6.0f); rotation += 90; modelViewMatrix = GLKMatrix4Rotate(modelViewMatrix, GLKMathDegreesToRadians(rotation), 0, 0, 1); self.effect.transform.modelviewMatrix = modelViewMatrix; } </code></pre> <p>And here is the loading method:</p> <pre><code>- (void)load{ self.effect = [[GLKBaseEffect alloc] init]; NSDictionary * options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], GLKTextureLoaderOriginBottomLeft, nil]; NSError * error; NSString *path = [[NSBundle mainBundle] pathForResource:@"tile_floor" ofType:@"png"]; GLKTextureInfo * info = [GLKTextureLoader textureWithContentsOfFile:path options:options error:&amp;error]; if (info == nil) { NSLog(@"Error loading file: %@", [error localizedDescription]); } self.effect.texture2d0.name = info.name; self.effect.texture2d0.enabled = true; glGenVertexArraysOES(1, &amp;vertexArray); glBindVertexArrayOES(vertexArray); glGenBuffers(1, &amp;vertexBuffer); glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW); glGenBuffers(1, &amp;indexBuffer); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Indices), Indices, GL_STATIC_DRAW); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const GLvoid *) offsetof(Vertex, Position)); glEnableVertexAttribArray(GLKVertexAttribColor); glVertexAttribPointer(GLKVertexAttribColor, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const GLvoid *) offsetof(Vertex, Color)); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (const GLvoid *) offsetof(Vertex, TexCoord)); glBindVertexArrayOES(0); } </code></pre> <p>And here is the rendering method:</p> <pre><code>- (void)render{ [self.effect prepareToDraw]; glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuffer); glBindVertexArrayOES(vertexArray); glDrawElements(GL_TRIANGLES, sizeof(Indices)/sizeof(Indices[0]), GL_UNSIGNED_BYTE, 0); } </code></pre> <p>Any help would be appreciated. Thanks. </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser1163876
    1. USuser1163876
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POOpenGL ES no Longer Displaying Object
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COCould you post [model update] and [model load]?
      singulars
      1. POOpenGL ES no Longer Displaying Object
      1. USwhooops
    2. COAlso, instead of commenting out the whole update method, find out which pieces cause the problem. Is it the translation? The rotation? If neither of those, comment them out anyway to make the diagnosis easier.
      singulars
      1. POOpenGL ES no Longer Displaying Object
      1. USwhooops
    3. COI tried commenting out the translation and rotation line individually with no luck. The screen remained black. But when I comment out both of them, then the object is drawn, but it fills the screen which is not what I want. The method above is the update method. I need to pass it the width and height of the view so that it can correctly create the perspective.
      singulars
      1. POOpenGL ES no Longer Displaying Object
      1. USuser1163876
 

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