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POApplying animations to objects in openGL
 

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  1. POApplying animations to objects in openGL
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    <p>I have stumbled upon a problem here while writing a program in which I am animating shapes using openGL.</p> <p>Currently in the program, I am creating some shapes, with the following snippet</p> <pre><code>for(int i=50;i&lt;=150;i=i+50){ for(int j=50;j&lt;=750;j=j+200){ //Draw rectangle shape at position(j,i); //shape has additional capability for animations } } </code></pre> <p>which gives me this output:</p> <p><img src="https://i.stack.imgur.com/bj2Fr.jpg" alt="enter image description here"></p> <p>Now, I have to resize these rectangles and move them all to another position. I have the final target <code>Point</code> for the first rectangle <code>rectangle at position[0][0]</code> where it should be moved. However, when I animate the size of these rectangles with something like</p> <p><code>rectangle.resize(newWidth, newHeight, animationTime);</code></p> <p>the rectangle for obvious reasons do not stick together, and I get something like:</p> <p><img src="https://i.stack.imgur.com/I1VdY.jpg" alt="enter image description here"></p> <p>I am looking for something like <code>Grouping</code> which can bind these shapes together, so that even when different animations like resize (and motion etc.) are applied, the vertices or the boundaries should be touching together.</p> <p>Note that <code>Grouping</code> is the main thing here. I might have a requirement in the future in which I would have to group the two rectangles in the last column, where independent animations (like rotations) already happening on them. So, I picture this something like a <code>plane/container</code> having these two rectangle and that <code>plane/container</code> itself can be animated for position etc. I am fine with algorithm/concept and not the code.</p>
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    1. COAFAIK there is no such common thing in opengl, you have to always manage rendering of your graphics objects all alone..
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      1. USSorceror
    2. CO@Sorceror: The other way of looking at this question would be to think of two animations being applied to a certain shape. (for eg: a rectangle being rotated on Y-axis, and that already animated rectangle itself further being rotated along X-axis.) This is similar to PowerPoint animations which can be applied simaltaneously to an object. Looking in that direction, does it help anyhow on how to apply two animations to a single object?
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      1. USCipher
    3. COif you want to apply more animation to one object, the best way is to use matrix transformations, then you can apply as many transformations as you will one to even single object, just by multiplying them (transformation matrices) together.. see http://en.wikipedia.org/wiki/Transformation_matrix
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