Start1er
commented
3 months ago [ bug for envmap plugin ]
platform: Unbuntu 20.04
mitsuba version latest 3.5.2
I debug for this plugin and now I find the problem, it was a bug, and the following was my scene_dict:
scene_dict = {
'type': 'scene',
'integrator': {
'type': prb_projective,
},
'env': {
'type': 'envmap',
'scale':1,
'filename': './scene/texture/black_image.png',
'mis_compensation': True,
},
'shape': {
'type': 'obj',
'filename': "anything.obj",
'bsdf': {
'type': 'principled',
'base_color': {
'type': 'bitmap',
'filename': './scene/texture/BRDF_resize/white_image.png',
'raw': False
},
'roughness': {
'type': 'bitmap',
'filename': './scene/texture/BRDF_resize/black_image.png',
'raw': True
},
'metallic': {
'type': 'bitmap',
'filename': './scene/texture/BRDF_resize/black_image.png',
'raw': True
},
'anisotropic':{
'type': 'bitmap',
'filename': './scene/texture/BRDF_resize/black_image.png',
'raw': True
}
}
# }
},
}
and when I run scene= mi.load_dict(scene_dict)
the bug arises in Ubuntu20.04 "Process finished with exit code 139 (interrupted by signal 11:SIGSEGV)".
However, when I change the 'mis_compensation': True into False. It works actually but full of variance.
So I'm here to ask for help about this bug, seems like I can not change the params to do Multiple Inportance Sampling in envmap. But why it happened. I am troubled with its desired. Maybe this plugin I use it in a wrong way? Any response would be appreatiate.
njroussel
Hi: I use your plugin envmap in my scene but the variance are very high, so I'm here to ask for help that how to use your envmap parameter
mis_compensationthe link https://mitsuba.readthedocs.io/en/stable/src/generated/plugins_emitters.html#:~:text=State%20parameters-,mis_compensation,-boolean which can use MIS to sample the light. I try to achieve in scene_params['env.mis_compensation'], but this seems not be a params can be achieved. I also try to specify in scene dict like the following:'env': { 'type': 'envmap', 'scale':1, 'filename': './scene/texture/black_image.png', 'mis_compensation': True, },it faied and program exit. would you like to kindly help me how to use MIS in envmap or how to reduce the high variance when the envmap caused?