Zero initialization

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Issue #30 resolved
David Williams created an issue

PolyVox is slightly messy with the way that classes are cleared to zero. For example, from MaterialDensityPair:

// FIXME - This is a bit odd... we need to allow the MaterialDensityPair to be initialised with a single integer
// because PolyVox often initialises voxels by calling VoxelType(0). Is there a better way we should handle this?
MaterialDensityPair(Type tValue) : m_uMaterial(tValue), m_uDensity(tValue) {}

According to p56 of 'C++ Templates' there is indeed a better way. It appears that built in types can be initialised to zero just with int() or float(), and that we should mimic this behaviour with the PolyVox classes.

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