<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi,<div><br></div><div><br></div><div><span style="background-color: rgb(255, 255, 255);"><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3">If have a 4x4 matrix that describes rotation and translation of the camera then how can I compute the camera position, focal point, up vector, and viewing angle parameters from the matrix ? </font></span></div><div><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3">Please if is possible write here a small example ! I’m using Python code.</font></div><div><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3"><br></font></div><div><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3">thanks </font></div><div><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3"><br></font></div><div><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3">Paolo</font></div><div><span style="background-color: rgb(255, 255, 255);"><font face="Calibri, Segoe UI, Meiryo, Microsoft YaHei UI, Microsoft JhengHei UI, Malgun Gothic, sans-serif" size="3"><br></font></span></div></body></html>