Whats the problem with that? You could just take the animtree vertex shader together with the depthmap pixelshader as well as with the pssm pixelshader. You may need to add some needed calculations to the vertex shader and could remove some that aren´t.

I don´t have the files here right now but from a google search and the animtree shader I found, I´d say you have to take the following parts of the tree shader:
Code:
float3 P = DoPos(inPos); //this might already be there, so just reuse it if it is
	
	float force_x = DoDefault(vecSkill41.x*(0.1/50),0.1); 
	float force_y = DoDefault(vecSkill41.y*(0.1/50),0.1);
	float offs = vecTime.w+0.2*(P.x+P.y+P.z);
	float speed = sin(offs * DoDefault(vecSkill41.z*(0.05/50),0.05));
	
	if(inPos.y > 0 ) // move only upper part of tree
	{
		inPos.x += speed * force_x * inPos.y;
		inPos.z += speed * force_y * inPos.y;
		inPos.y -= 0.1*abs(speed*(force_x+force_y)) * inPos.y;
	}
	Out.Pos = DoTransform(inPos); //this should already be in the other shaders, just make sure to put the code above in front of it

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com