Node setup for sprites rendering

Code Snippets
6

I draw cardmarker with original size of texture with a little code:

def create_sprite(filename, x, z, screenWidth, screenHeight, transparent=1):    
    tex = loader.loadTexture(filename)   
    cm = CardMaker('spritesMaker')
    sprite = NodePath(cm.generate())    
    sprite.setTexture(tex)
    
    #Scale and position
    sx = float(tex.getXSize()) / screenWidth
    sz = float(tex.getYSize()) / screenHeight
    sprite.setScale(sx, 1.0, sz)
    sprite.setPos(x, 0.0, z) 
    sprite.setTransparency(transparent)
    return sprite