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POopenGL ES how to get perspective view?
 

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  1. POopenGL ES how to get perspective view?
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    <p>I'm trying to draw a simple cube, rotated 45 deg about y-axis. My drawing code looks like this:</p> <pre><code>- (void) Draw: { // Set the viewport //glFrustumf( -1.0, 1.0, -1.0/(backingWidth/backingHeight), 1.0/(backingWidth/backingHeight), 0.01, 10.0 ); glViewport ( 0, 0, backingWidth, backingHeight ); // Clear the color buffer glClear ( GL_COLOR_BUFFER_BIT ); if( [context API] == kEAGLRenderingAPIOpenGLES2 ) [self DrawES2]; else [self DrawES1]; glDrawElements(GL_TRIANGLES, sizeof(indices)/sizeof(GLubyte), GL_UNSIGNED_BYTE, indices); } - (void) DrawES2 { // Use the program object glUseProgram ( programObject ); // Load the vertex data glVertexAttribPointer ( 0, 3, GL_FLOAT, GL_FALSE, 0, vVertices ); glEnableVertexAttribArray ( 0 ); // Load transformation matrix GLint mvpLoc = glGetUniformLocation( programObject, "u_mvpMatrix" ); glUniformMatrix4fv( mvpLoc, 1, GL_FALSE, yRotation ); } - (void) DrawES1 { glMatrixMode(GL_PROJECTION); glLoadIdentity(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef( 45, 0, 1, 0 ); glVertexPointer(3, GL_FLOAT, 0, vVertices); glEnableClientState(GL_VERTEX_ARRAY); glColor4f(1.0, 0.0, 0.0, 1.0); } </code></pre> <p>What I get is something like this: <a href="http://img828.imageshack.us/img828/5319/wrongl.png" rel="nofollow">enter link description here</a></p> <p>What I want is something like this: <a href="http://img141.imageshack.us/img141/577/rightc.png" rel="nofollow">enter link description here</a></p> <p>When I uncomment the glFrustum line I get no change in ES1 version and app crashes in ES2 version. I'm new to OpenGL so I guess I could be doing something really wrong, but how do I get a perspective view so that the cube looks right?</p>
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