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POAppropriate use of GLKBaseEffect
 

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    <p>Ahoy!</p> <p>I've been looking into updating some old test code in an attempt to brush up on the new features added to GLKit. So far i've managed to set up a GLKViewController and start rendering some basic shapes but have struggled to find any decent information regarding GLKBaseEffect.</p> <p>The GLKBaseEffect documentation states:</p> <blockquote> <p>At initialization time, your application first creates an OpenGL ES 2.0 context and makes it current. Then, it allocates and initializes a new effect object, configures its properties, and calls its prepareToDraw method. Binding an effect causes a shader to be compiled and bound to the current OpenGL ES context. The base effect also requires vertex data to be supplied by your application. To supply vertex data, create one or more vertex array objects. For each attribute required by the shader, the vertex array object should enable the attribute and point to data stored in a vertex buffer object.</p> </blockquote> <p>What i'm struggling to discern is; </p> <p>Do I need a GLKBaseEffect object for each "model" I'm rendering? Or do I use a single GLKBaseEffect for each "scene" and simply change the properties on the fly before calling prepareToDraw?</p> <p>I've seen a few tutorials for game engines and renderers that simply use a single GLKBaseEffect for each model but this seems wholly inefficient if the same could be achieved with a single instance instead. </p> <p>From reading the documentation it almost seems like this is the best approach but considering i've seen so many people using multiple instances, i'm starting to think that this isn't the case. </p> <p>Can anyone shed any light on this? GLKit is still fairly new to iOS (and to me) so any information would be greatly appreciated.</p>
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    1. COHas no-one used GLKBaseEffect extensively enough to provide insight? I'm curious about the performance gains if using a single instance or if multiple instances are required. I'll write up a test app and post my results for anyone who may be interested.
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