How to get the CardMaker pos?

Code Snippets
1

I use this function to display one frame image. But when I try to getMat or getPos， the card return
as if it is on (0,0,0)

def create_image(self, frame, s_to_t=None):
        if s_to_t is None:
            s_to_t = np.eye(4)
        height, width = frame.shape[:2]
        cm = CardMaker('card')
        p1 = LVector3(*np.matmul(s_to_t, np.array([-width / 2, height, 0, 1]))[:3]) # 
        p2 = LVector3(*np.matmul(s_to_t, np.array([width / 2, height, 0, 1]))[:3])
        p3 = LVector3(*np.matmul(s_to_t, np.array([width / 2, 0, 0, 1]))[:3])
        p4 = LVector3(*np.matmul(s_to_t, np.array([-width / 2, 0, 0, 1]))[:3])
        cm.setFrame(p4, p3, p2, p1) # ll, lr, ur, ul  # vertical flip

        card = self.render.attachNewNode(cm.generate())
        tex = Texture()


        tex.setup2dTexture(width, height, Texture.T_unsigned_byte, Texture.F_rgba8)
        frame=rgb2rgba(frame)
        buf = frame.tobytes()
        tex.setRamImage(buf)
        card.setTexture(tex)
        card.hide()
        card.setTransparency(TransparencyAttrib.M_alpha)
        # card.setMat(self.np4ToM4(s_to_t))   # if I set the mat, I can get the Mat, but the frame display at another position
        return card
2

Greetings, and welcome to the forum! I hope that you find your time here to be positive! :slight_smile:

As to your question… Well, looking at your code, I don’t see anything that sets the position of the card being produced by the CardMaker, and the default position for a node is (0, 0, 0), so indeed, that’s what I’d expect to be reported by “getPos”.

That is to say: Calling “getPos” (or “getMat”) is indeed the way to find the position of a card made by CardMaker–as with any NodePath. It’s just that your card is in fact at (0, 0, 0), and thus that’s the value reported by those methods.

3

Thank you very much, I solved this problem which was caused by setting Mat to the texture while not the card.

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