render another normal camera but the texture are wrong

i use an ar camera in my scene and i just use it for discriminate the target and it will control the character in a normal camera view . everything is just ok in editor but when i change the ar camera from default to front camera the texture of the terrain and my character looks not right. i can see through the model and the texture toward the scene are like transparent.can anyone tell me how to fix it ? thanks so much!