Anfänger in OpenGL ES: Problem bei der Darstellung eines Objektes im GLKViewController

Seibold · 2. Februar 2013, 15:34

Hallo erstmal

Ich kämpfe schon seit geraumer Zeit mit OpenGL, und wollte nun ein Objekt (exportiert aus Blender / ohne Textur) in den
GLKview vom GLKViewController bringen. Jedoch wird anscheinend nichts projiziert? Ich weiß einfach nicht an was das liegen kann.. Ist das Objekt aus dem Sichtfeld? Kann ich mir aber iwie nicht vorstellen

wäre toll wenn sich jemand mit OpenGL auskennt und mir weiter helfen könnte.

mfg Seibold

Quellcode

#import "FlascheGLKViewController.h"
int H = 1024;
int W = 768;
@interface FlascheGLKViewController ()
{
float _curRed;
BOOL _increasing;
}
@end
@implementation FlascheGLKViewController
@synthesize context;
@synthesize effect;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.context = [[EAGLContext alloc]initWithAPI:kEAGLRenderingAPIOpenGLES1];
if (!self.context) {
NSLog(@"Failed to create ES context");
}
GLKView *view = (GLKView*)self.view;
view.context = self.context;
view.drawableDepthFormat = GLKViewDrawableDepthFormat16;
[self setUpGL];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
NSLog(@"ich bin der Fehler");
[super didReceiveMemoryWarning];
if ([self isViewLoaded] && ([[self view] window] == nil))
{
self.view = nil;
[self tearDownGL];
if ([EAGLContext currentContext] == self.context)
{
[EAGLContext setCurrentContext:nil];
}
self.context = nil;
}
}
- (void) tearDownGL
{
// [EAGLContext setCurrentContext:self.context];
// glDeleteBuffers(1, &vertexBuffer);
// self.effect = nil;
}
-(void) glkView:(GLKView *)view drawInRect:(CGRect)rect {
glClearColor(0.6, 0.1, 0.0, 1.0); // RGB und Alpha
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
GLKMatrix4 gml = GLKMatrix4MakeLookAt(0, 0, 1, //Kamera Position
0, 0.3, 0.5, //Look At
0, 1, 0); //"Stehend"
glMultMatrixf(gml.m);
[self drawOGLCube];
}
-(void) update{
// float aspect = fabsf(self.view.bounds.size.width / self.view.bounds.size.height);
glLoadIdentity();
H = self.view.bounds.size.width;
W = self.view.bounds.size.width;
int w = W;
int h = H;
glMatrixMode(GL_PROJECTION);
float zNear = 0.1;
float zFar = 2500;
float fieldOfViewAngle = 10;
float top = zNear * tan(M_PI * fieldOfViewAngle / w);
float bottom = -top;
float left = bottom * w / h;
float right = top * w / h;
glFrustumf(left, right, bottom, top, zNear, zFar); //3D-Perspektive
//Enable Modelview: Auf das Rendern von Vertex-Arrays umschalten
glMatrixMode(GL_MODELVIEW);
glEnableClientState(GL_VERTEX_ARRAY);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
//Light
glEnable(GL_LIGHTING);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHT0);
GLfloat color0[ ] = {1, 1, 1, 1};
glLightfv(GL_LIGHT0, GL_DIFFUSE, color0);
GLfloat light_position0[ ] = {0, 1, 0, 0};
glLightfv(GL_LIGHT0, GL_POSITION, light_position0);
/* GLKMatrix4 projectionMatrix = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(50), aspect, 0.1, 100);
// static __inline__ GLKMatrix4 GLKMatrix4MakePerspective(float fovyRadians, float aspect, float nearZ, float farZ)
self.effect.transform.projectionMatrix = projectionMatrix;
GLKMatrix4 modelMatrix = GLKMatrix4MakeTranslation(0, 0, -7);
modelMatrix = GLKMatrix4RotateY(modelMatrix, rotation);
self.effect.transform.modelviewMatrix = modelMatrix;
*/
// rotation += self.timeSinceLastUpdate;
}
- (void) setUpGL {
[EAGLContext setCurrentContext:self.context];
/*
self.effect = [[GLKBaseEffect alloc]init];
self.effect.light0.enabled = GL_TRUE;
self.effect.light0.diffuseColor = GLKVector4Make(1, 0.8, 1.5, 1.0);
*/
//Modelview: Auf das Rendern von Vertex Arrays umschalten
/*
glEnable(GL_DEPTH_TEST);
glMatrixMode(GL_MODELVIEW);
glEnableClientState(GL_VERTEX_ARRAY);
glDepthFunc(GL_LESS);
*/
}
- (void) drawOGLCube {
NSLog(@"drawOGLCube");
GLfloat vertices[ ] = {
-0.157871, 0.952064, -0.988728, 0.037220, 0.952064, -0.969513, 0.224813, 0.952064, -0.912607, 0.397700, 0.952064, -0.820197, 0.549236, 0.952064, -0.695835, 0.673599, 0.952064, -0.544298, 0.766009, 0.952064, -0.371411, 0.822915, 0.952064, -0.183818, 0.842129, 0.952064, 0.011272, -0.157871, 2.952064, 0.011272, 0.822915, 0.952064, 0.206362, 0.766009, 0.952064, 0.393956, 0.673599, 0.952064, 0.566842, 0.549236, 0.952064, 0.718379, 0.397700, 0.952064, 0.842742, 0.224813, 0.952064, 0.935152, 0.037219, 0.952064, 0.992058, -0.157871, 0.952064, 1.011272, -0.352961, 0.952064, 0.992057, -0.540555, 0.952064, 0.935152, -0.713441, 0.952064, 0.842742, -0.864978, 0.952064, 0.718379, -0.989341, 0.952064, 0.566842, -1.081751, 0.952064, 0.393955, -1.138656, 0.952064, 0.206362, -1.157871, 0.952064, 0.011271, -1.138656, 0.952064, -0.183819, -1.081750, 0.952064, -0.371412, -0.989340, 0.952064, -0.544299, -0.864977, 0.952064, -0.695835, -0.713440, 0.952064, -0.820198, -0.540553, 0.952064, -0.912608, -0.352959, 0.952064, -0.969513
};
GLfloat normals[ ] = {
-0.259887, 0.445488, -0.856737, 0.087754, 0.445488, -0.890977, -0.087753, 0.445488, -0.890977, 0.259888, 0.445488, -0.856737, -0.422035, 0.445488, -0.789574, -0.567964, 0.445488, -0.692067, -0.692066, 0.445488, -0.567966, -0.789573, 0.445488, -0.422036, -0.856737, 0.445488, -0.259889, -0.890977, 0.445488, -0.087755, -0.890977, 0.445488, 0.087753, -0.856737, 0.445488, 0.259888, -0.789574, 0.445488, 0.422035, -0.692067, 0.445488, 0.567964, -0.567965, 0.445488, 0.692066, -0.422036, 0.445488, 0.789573, -0.259889, 0.445488, 0.856737, -0.087754, 0.445488, 0.890977, 0.087753, 0.445488, 0.890977, 0.259888, 0.445488, 0.856737, 0.422036, 0.445488, 0.789573, 0.567965, 0.445488, 0.692067, 0.692067, 0.445488, 0.567965, 0.789573, 0.445488, 0.422035, 0.856737, 0.445488, 0.259888, 0.890977, 0.445488, 0.087753, 0.890977, 0.445488, -0.087754, 0.856737, 0.445488, -0.259888, 0.789573, 0.445488, -0.422036, 0.692067, 0.445488, -0.567965, 0.567965, 0.445488, -0.692067, 0.422036, 0.445488, -0.789573, 0.000000, -1.000000, -0.000000
};
GLushort faces[ ] = { //12 Faces = 6 Wuerfelseiten mit je zwei Dreiecken
31, 9, 32, 0, 9, 1, 9, 0, 32, 1, 9, 2, 30, 9, 31, 29, 9, 30, 28, 9, 29, 27, 9, 28, 26, 9, 27, 25, 9, 26, 24, 9, 25, 23, 9, 24, 22, 9, 23, 21, 9, 22, 20, 9, 21, 19, 9, 20, 18, 9, 19, 17, 9, 18, 16, 9, 17, 15, 9, 16, 14, 9, 15, 13, 9, 14, 12, 9, 13, 11, 9, 12, 10, 9, 11, 8, 9, 10, 7, 9, 8, 6, 9, 7, 5, 9, 6, 4, 9, 5, 3, 9, 4, 2, 9, 3, 0, 1, 32, 1, 31, 32, 1, 2, 31, 2, 30, 31, 2, 3, 30, 3, 29, 30, 3, 4, 29, 4, 28, 29, 4, 5, 28, 5, 27, 28, 5, 6, 27, 6, 26, 27, 6, 7, 26, 7, 25, 26, 7, 8, 25, 8, 24, 25, 8, 10, 24, 10, 23, 24, 10, 11, 23, 11, 22, 23, 11, 12, 22, 12, 21, 22, 12, 13, 21, 13, 20, 21, 13, 14, 20, 14, 19, 20, 14, 15, 19, 15, 18, 19, 15, 16, 18, 16, 17, 18
};
//Anzahl der Array-Elemente
//int verticesLength = sizeof(vertices) / sizeof(GLfloat);
int facesLength = sizeof(faces) / sizeof(GLushort);
//Render obj-Modell
glEnableClientState(GL_NORMAL_ARRAY); //normal arrays aktivieren
glEnable(GL_NORMALIZE);
glEnable(GL_CULL_FACE); //Nicht sichtbare Flaechen ignorieren
glCullFace(GL_BACK);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glNormalPointer(GL_FLOAT, 0, normals);
glColor4f(1, 1, 0, 1); //Einfaerben
//Matrix-Operations
glPushMatrix();
glTranslatef(0, 0, -7);
static int angle = 0; angle += 2;
glRotatef(angle, 0, 1, 0);
//glDrawArrays(GL_TRIANGLE_STRIP, 0, verticesLength/3);
glDrawElements(GL_TRIANGLES, facesLength, GL_UNSIGNED_SHORT, faces);
glPopMatrix();
//Cleanup
// glDisableClientState(GL_NORMAL_ARRAY);
glDisable(GL_NORMALIZE);
glDisable(GL_CULL_FACE);
//glDrawArrays(GL_TRIANGLE_STRIP, 0, verticesLength/3); //-> obj liefert faces
}
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
self.paused = !self.paused ;
}
@end

Alles anzeigen

wolf_10de · 3. Februar 2013, 11:24

Nachdem du ne Matrix aktivierst solltest du sie mit

Quellcode

glLoadIdentity();

initialisieren. Probier das mal aus.

Seibold · 3. Februar 2013, 21:59

habs nochmal durch programmiert

jetzt funktioniert es
ich hab aber keine Ahnung wieso

aber danke für deine Antwort

wolf_10de · 4. Februar 2013, 05:47

Seibold schrieb:

ich hab aber keine Ahnung wieso

Das ist immer klasse