The video you are watching is a troubleshooting video with one of the students. One of the students of the academy had a problem with the lighting of this project. There was a light in this project in a strange way and it didn’t disappear and even its source was not clear. Initial investigations were done with the student, but there was no result, and the student sent it to the course instructor, Hamed Gholamreza, to fix the problem in a video. With the methods you see in the video, that strange light is removed and the scene returns to normal. In this 22-minute troubleshooting video, during troubleshooting, the course instructor gives suggestions to improve the performance of the viewport and replace 3D objects. Ghori Architecture Academy started its activity in 2017 and currently has 1488 active students. It has 14 architecture courses. The founder of Ghori Academy of Architecture is Mr. Hamed Gholamreza. Thanks to dear colleagues, including Mustafa Chakhari, Hadi Nazari, Nilofar Fatahi, Milad Soltani, Marwarid Naqibi, Maryam Sayad and many others whose names are not mentioned.