z axis direction of sensor to_world transform

[tangjm24]

Currently I have trouble in define the to_world transform matrix in multi-view rendering.

I use official teapot data from mitusba3 demo data for demonstration.

First I open the downloaded mesh with MeshLab and got the image in fig.1. So I guess if I use the identity transformation matrix, the rendering result will be the same with the MeshLab visualization. However I found the rendering result was transpose. Does the z axis direction is differently difination.

my code:

scene_dict = {  
    'type': 'scene',  

    'integrator': {  
        'type': 'path'  
    },  

    'emitter': {  
        'type': 'envmap',  
        'filename': 'envmap.exr'
        'scale': 1.0  
    },  

    'ply_object': {  
        'type': 'ply',  
        'filename': "\path\to\teapot.ply",  
        'face_normals': True,  
        'bsdf': {  
            'type': 'principled',  
            'metallic': 0.1,     
            'roughness': 0.2    
        },  

    },
}  



# 加载并渲染场景  
scene = mi.load_dict(scene_dict)  



to_world = np.array(
        [[1,0,0,0],[0,1,0,0],[0,0,1,-12],[0,0,0,1]]
    )
to_world = T(to_world)
print(to_world)
sensor: mi.Sensor = mi.load_dict({
    "type": "perspective",
    "fov": 60,
    "to_world": to_world,
    'film': {  
        'type': 'hdrfilm',  
        'width': 3950,  
        'height': 2968,  
        'rfilter': {'type': 'gaussian'},  
        'pixel_format': 'rgb'  
    }, 
})

scene = mi.load_dict(scene_dict)