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2011-04-29T14:25:41.197
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As SuperMaximo93 says, it's important to separate your transformation matrices, so that all objects are drawn with their own unique transformation. <code>glPushMatrix()</code> is a relatively easy way to handle this. I should add that it's also important that you call your transformation functions (glTranslatef/Rotatef/Scalef/etc) in the correct order. OpenGL multiplies transformation matrices in post-order (as opposed to pre-order). So when you call <code>glRotatef()</code>, the current matrix, C, is multiplied by the rotation matrix representing the <code>glRotate()</code> call, M, in the following way: C x M and a position (or vector), v transformed by the call is transformed in the following way: C x M x v This forces you to call the transformation functions in an order which may seem reverse of what should be accomplished. For example: <pre><code>glTranslatef(0.0f, 1.0f, 0.0f); glRotatef(30.0f, 0.0f, 0.0f, 1.0f); drawMyObject(); </code></pre> The effect of the code above would be that the object drawn will first be rotated 30 degrees CCW, then translated upwards on the screen by 1.0 (assuming positive is up on the y-axis), as opposed to first being translated up, then being rotated along the center of the screen by 30 degrees CCW. Also see <a href="http://www.opengl.org/sdk/docs/man/xhtml/glMultMatrix.xml" rel="nofollow">http://www.opengl.org/sdk/docs/man/xhtml/glMultMatrix.xml</a> for more documentation on this.
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1. POIs it possible to draw multiple 3D objects having its independent planes or axis respectively?
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1. USVictor Zamanian
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1. CObut the problem here is i use transformation in void keyspecial( GLint key, GLint x, GLint y ) function, so i cant implement the above structure u recommended :
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2. COWhy not? This is C++, you can do *anything*. :) Note that I'm not telling you how to code; the code in my answer is merely an example of the effects of post-order matrix multiplication.
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