OpenGL VSM problem

Hello!

I am having a big problem implementing VSM and I have been stucked for a couple of days.

When I use VSM instead of a basic shadow mapping, all the scene turns black. I think the shadow map that I am generating is good, so I dont understand what is happening.

This is the code I use to generate this dual channel depth map:

for (int i = 0; i < SHADOWMAP_CASCADE_COUNT; i++)
	{
		//generamos los shadowmaps originales, donde …