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Adding LOD to the Model Class



The Model class is being slightly restructured to add support for built-in LOD without the need for separate entities. Previously, a list of surfaces was included in the Model class itself:

class Model
	std::vector<shared_ptr<Surface> > surfaces;

This is being replaced with a new LOD class, which allows multiple lists of surfaces containing less detail to be stored in the same model:

class LOD
	std::vector<shared_ptr<Surface> > surfaces;

class Model
	std::vector<LOD> lods;

To iterate through all surfaces in the first LOD, you do this:

for (int i = 0; i < model->lods[0].surfaces.size(); ++i)
	auto surf = lods[0].surfaces[i];

To iterate through all LODs and all surfaces, you do this:

for (int n = 0; n < model->lods.size(); ++n)
	for (int i = 0; i < model->lods[n].surfaces.size(); ++i)
		auto surf = lods[n].surfaces[i];

In the future editor, I plan to add a feature to automatically reduce the detail of a mesh, adding the simplified mesh as an additional LOD level so you can automatically generate these.

How this will work with our super-efficient batching system, I am not sure of yet.

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How are LODs currently being handled in LE4? I remember seeing tutorials on this in previous Leadwerks releases but not sure if the system has changed.

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