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    <p>If you want to see movement, you should update mTriangle.mAngle each frame (preferably as a function of time to combat speed differences or delays caused by other processes...).</p> <p>Note that Matrix.setIdentityM(mModelMatrix, 0); restores all the accumulated rotations and translations to "zero" or actually to Identity Matrix... The same convention applies btw to all <em>set</em> functions. To accumulate all the transformations, one has to</p> <ul> <li>setIdentity(model);</li> <li>translate(trans); // to get the origin of rotation</li> <li>rotate(rotmatrix); // to accumulate the rotation</li> <li>translate(t2); // to translate again to some better position...</li> </ul> <p>Also one should keep the values of object translation vector [ox,oy,oz] between each call and feed them to Matrix.translateM(mModelMatrix, ox, oy, oz, 0);</p> <p>Typically one concatenates all 'translate, rotate, scale', etc. matrices as early as possible and cache them per object, or hierarchically per a complex container having multiple objects and having a bounding box, so that multiple objects can be culled when on behind the camera (or generally outside the viewing frustum).</p> <p>Also typically one keeps a moving camera in one matrix and per frame multiplies it with the projection matrix.</p> <p>You can start with something like:</p> <pre><code>float Time = System.currentTimeMillis() * 0.01f; // 10 radians / second == fast! Matrix.translateM(mModelMatrix, Math.sin(Time)*2.0f, 0, 1f, 0); ... </code></pre> <p>As Tim noticed, there is no projection matrix involved, meaning that all z-values behave in this code exactly, even though changing x &amp; y values would make a difference. </p> <p>I'd be tempted to say, that MVP matrix would mean multiplying in order M * V * P = (M*V) * P = M * (V*P).</p>
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    1. POOpenGL ES Android Matrix Transformations
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    1. USAki Suihkonen
    1. USAki Suihkonen
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    1. COi forgot to mention that the drawing method is triggered by my EventListener, so i guess, i dont need the time function yet. My triangle rotates as expected. It just doesnt move along axes.
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      1. USMichael T
    2. COThat's because there is this *setRotate* instead of Matrix.rotateM. (or whatever it is in Android GLES API)
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      1. USAki Suihkonen
    3. COI have now `Matrix.setIdentityM(mModelMatrix, 0); Matrix.setIdentityM(mMVPMatrix, 0); Matrix.translateM(mModelMatrix, 0, 1f, 0f, 0); Matrix.rotateM(mModelMatrix, 0, mTriangle.mAngle, 0, 0, -1.0f); Matrix.multiplyMM(tempMatrix, 0, mVMatrix, 0, mModelMatrix, 0); Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, tempMatrix, 0);` and still see rotation around the Z-Axis only and no any other movement. Thanks for the tip with translating the objects to the origin. I will address this problem after i manage it to move the object off the origin.
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      1. USMichael T
 

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