CODEWITHSUNDEEP
androidopengl-es
Victor S
Victor S

Reputation: 4201

What's wrong with the result of android.opengl.Matrix.rotateM?

My code:

            float[] rotatePlus90Mtx = identityMatrix.clone();
            Matrix.setRotateM(rotatePlus90Mtx, 0, 90, 0, 0, 1);
            Log.e(TAG, "RotatePlus90 Matrix: ");
            dumpMatrix(rotatePlus90Mtx);

the result:

-4.371139E-8 1.0 0.0 0.0
-1.0 -4.371139E-8 0.0 0.0

0.0 0.0 1.0 0.0

0.0 0.0 0.0 1.0

why there is -4.371139E-8? should be 0 correctly?

Upvotes: 0

Views: 168

Answers (1)

solidpixel
solidpixel

Reputation: 12229

It pretty much is zero; floating point numbers are not precise ...

Worth a read:

Upvotes: 3

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