import pybullet as p
p.connect(p.GUI)
plane = p.loadURDF("plane.urdf")
visualData = p.getVisualShapeData(plane, p.VISUAL_SHAPE_DATA_TEXTURE_UNIQUE_IDS)
print(visualData)
curTexUid = visualData[0][8]
print(curTexUid)
texUid = p.loadTexture("tex256.png")
print("texUid=", texUid)

p.changeVisualShape(plane, -1, textureUniqueId=texUid)

for i in range(100):
  p.getCameraImage(320, 200)
p.changeVisualShape(plane, -1, textureUniqueId=curTexUid)

for i in range(100):
  p.getCameraImage(320, 200)