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POOpenGL ES 2.0 Multiple Instances of Textured Object
 

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    <p>I am using Blender to create a 3D cow and obtain the correct vertices (optimized afterwards to remove duplicates). I have created a Cow Class to be able to draw multiple instances of this cow on screen. </p> <p>Cow 1 is drawn at <strong>(-2,0,-10)</strong> and Cow 2 is drawn at <strong>(2,0,-10)</strong>. When I render cow 1 only I see Cow 1 at <strong>(-2,0,-10)</strong>. When I render either both cows or only cow 2 (comment render cow 1 out), I only get cow 2 (do not see cow 1) at <strong>(2,0,-10)</strong>. I am making a game where I will have many enemies running around and I need to be able to draw multiple instances of these objects and render them independently at different locations. Can anyone tell me what I am doing wrong? Thanks</p> <pre><code>// // Cow.m // #import "Cow.h" #import "cow_verts.h" @implementation Cow - (id)initWithContext:(EAGLContext *)aContext { context = aContext; effect = [[GLKBaseEffect alloc] init]; [EAGLContext setCurrentContext:context]; sharedResourceManager = [ResourceManager sharedResourceManager]; UIImage *textureImage = [UIImage imageNamed:@"cowUV.png"]; texture = [sharedResourceManager addTexture:textureImage]; position = GLKVector3Make(0,0,0); rotation = GLKVector3Make(0,0,0); scale = GLKVector3Make(1,1,1); [self setupGL]; return self; } - (void)setupGL { glGenVertexArraysOES(1, &amp;_vao); glBindVertexArrayOES(_vao); glGenBuffers(1, &amp;_dynamicVBO); glBindBuffer(GL_ARRAY_BUFFER, _dynamicVBO); glBufferData(GL_ARRAY_BUFFER, sizeof(CowDynamicVertexData), CowDynamicVertexData, GL_DYNAMIC_DRAW); glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, sizeof(dynamicVertexData), (void *)offsetof(dynamicVertexData, position)); glEnableVertexAttribArray(GLKVertexAttribPosition); glGenBuffers(1, &amp;_staticVBO); glBindBuffer(GL_ARRAY_BUFFER, _staticVBO); glBufferData(GL_ARRAY_BUFFER, sizeof(CowStaticVertexData), CowStaticVertexData, GL_STATIC_DRAW); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, sizeof(staticVertexData), (void *)offsetof(staticVertexData, texCoord)); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glGenBuffers(1, &amp;_indexBuffer); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(CowIndices), CowIndices, GL_STATIC_DRAW); glBindVertexArrayOES(0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); glBindBuffer(GL_ARRAY_BUFFER, 0); } - (void)updateWithDelta:(float)aDelta { float aspect = fabsf([[UIScreen mainScreen] bounds].size.width/ [[UIScreen mainScreen] bounds].size.height); GLKMatrix4 projectionMatrix = GLKMatrix4MakePerspective(GLKMathDegreesToRadians(65.0f), aspect, 4.0f, 20.0f); effect.transform.projectionMatrix = projectionMatrix; rotation.y += 90 * aDelta; } - (void)render { [EAGLContext setCurrentContext:context]; glClearColor(0, 1, 1, 1); glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT); GLKMatrix4 xRotationMatrix = GLKMatrix4MakeXRotation(GLKMathDegreesToRadians(rotation.x)); GLKMatrix4 yRotationMatrix = GLKMatrix4MakeYRotation(GLKMathDegreesToRadians(rotation.y)); GLKMatrix4 zRotationMatrix = GLKMatrix4MakeZRotation(GLKMathDegreesToRadians(rotation.z)); GLKMatrix4 scaleMatrix = GLKMatrix4MakeScale(scale.x, scale.y, scale.z); GLKMatrix4 translateMatrix = GLKMatrix4MakeTranslation(position.x, position.y, position.z); GLKMatrix4 modelMatrix = GLKMatrix4Multiply(translateMatrix, GLKMatrix4Multiply(scaleMatrix, GLKMatrix4Multiply(zRotationMatrix, GLKMatrix4Multiply(yRotationMatrix, xRotationMatrix)))); effect.transform.modelviewMatrix = modelMatrix; //GLKMatrix4 viewMatrix = GLKMatrix4MakeLookAt(0, 0, 3, 0, 0, 0, 0, 1, 0); //effect.transform.modelviewMatrix = GLKMatrix4Multiply(viewMatrix, modelMatrix); effect.texture2d0.name = texture.name; effect.texture2d0.target = texture.target; effect.texture2d0.envMode = GLKTextureEnvModeReplace; glEnable(GL_DEPTH_TEST); glEnable(GL_CULL_FACE); glCullFace(GL_FRONT); glBindVertexArrayOES(_vao); [effect prepareToDraw]; glDrawElements(GL_TRIANGLES, sizeof(CowIndices)/sizeof(CowIndices[0]), GL_UNSIGNED_INT, (void *)0); glBindVertexArrayOES(0); glBindBuffer(GL_ARRAY_BUFFER, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); glDisable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); } @end // // Cow.h // @interface Cow : NSObject { EAGLContext *context; GLuint _vao; GLuint _staticVBO; GLuint _dynamicVBO; GLuint _indexBuffer; GLKTextureInfo *texture; GLKBaseEffect *effect; GLKVector3 position; GLKVector3 rotation; GLKVector3 scale; ResourceManager *sharedResourceManager; } - (id)initWithContext:(EAGLContext *)aContext; - (void)updateWithDelta:(float)aDelta; - (void)render; @end // // Scene which creates these objects and calls the functions // #import "Cow.h" @implementation GameScene { NSMutableArray *cows; } - (id)init { if(self = [super init]) { sharedDirector = [Director sharedDirector]; [EAGLContext setCurrentContext:[sharedDirector context]]; cows = [[NSMutableArray alloc] init]; AbstractEnemy *cow1 = [[Cow alloc] initWithContext:[sharedDirector context]]; cow1.position = GLKVector3Make(-2, 0, -10); [cows addObject:cow1]; AbstractEnemy *cow2 = [[Cow alloc] initWithContext:[sharedDirector context]]; cow2.position = GLKVector3Make(2, 0, -10); [cows addObject:cow2]; AbstractEnemy *cow3 = [[Cow alloc] initWithContext:[sharedDirector context]]; cow3.position = GLKVector3Make(0, 0, -15); [cows addObject:cow3]; } return self; } - (void)updateWithDelta:(GLfloat)aDelta { for (int i = 0; i &lt; cows.count; i++) { [cows[i] updateWithDelta:aDelta]; } } - (void)render { for (int i = 0; i &lt; cows.count; i++) { [cows[i] render]; } } @end </code></pre>
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