private void updateTankMaterial() {
        emissionPower = Math.max(emissionPower, 0);
        emissionIntensity = Math.max(emissionIntensity, 0);
        tankMat.setFloat("EmissivePower", emissionPower);
        tankMat.setFloat("EmissiveIntensity", emissionIntensity);
    }
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