private String floatToString(float value, int length) {
        String string = Float.toString(value);
        return string.substring(0, Math.min(length, string.length()));
    }
Tests {@link SoftBloomFilter} with HDR.
<p>
Note: the camera is pointed directly at the ground, which is completely
black for some reason.

@author codex
jme3-examples/src/main/java/jme3test/post/TestSoftBloom.java