How to apply point value on local coordinate system rather than world coordinate system

Hi @JVene, Thanks very much for your reply and time. Long time no hear! I am glad that you answered. Sorry that the above explainations were not clear, I will explain the whole setup. One aspect that makes the issue somehow tricky is that I start the application on a head mounted AR-device (the microsoft hololens), that means that the coordinate system of the main camera is depending on my heads position at the starting time of the app. The next important thing is, in my room there is a roboter with a marker on it. $$anonymous$$y app can scan this marker and based on the position of the marker it will place the anchor once (I will explain why to place an anchor later on). So the anchors coordinate system is depending on the position and orientation of the robot, and its marker, not the main camera. Assu$$anonymous$$g for example that at the start of the app, the robot and marker on it, is to my right and the robot x-axis(forward direction) is positive to my right, whereas my head is looking forward, thus the x axis of the main camera is pointing forward, we have two different coordinate systems, with both x axes perpendicular to each other. And unfortunately things will get a little more complicated (at least for me), because what I get is data from another computer(controlling the real robot),I will call it ROS, which itself has another coordinate system and provides data about the position of the robot in (x,y) coordinates with respect to its own coordinate system, without knowing anything about unity and hololens. $$anonymous$$y tasks is to synchronize all 3 coordinate systems so that the data I get from ROS, will display correctly in Unity/Hololens. Fortunately what I could get from ROS (also through websockets) is the distance between the robot and the origin of the ROS coordinate system. Thats why my idea was to scan the marker, get the position of the marker (= position of the real robot, cause the marker is on the robot) place a virtual robot on that marker position, then add the above mentioned distance between robo and origin to that marker position and place the anchor on that positon. This way the anchor will represent the origin of the ROS coordinate system. I have made my anchor child to the virtual robot so the coordinates I get from the robo will be displayed rightly cause now its with respect to the virtual robots coordinate system( which is also the real robo cause there is the marker on it, sorry that I repaet myself). Now the data I get is sensor data about the position of the real robot with respect to the ROS coordinate system. So thats why i have to apply that data to the anchor. So for example if I get from ROS (x,y) = (2,0), I would like to move the virtual robot to (2,0) with respect only to the anchors coordinate system. $$anonymous$$y idea was to child another virtual robot, lets call it robo2) to that anchor(which itself is a child of the first virtual robot) but that is not working somehow and gives me wrong results.

Hi @JVene, I have thought about an idea. Is it possible to place an different coordinate system depending on the orientation of the marker? If I scan the marker, the object is just placed on that marker with some rotation to it with respect to the same main camera coordinate system. So ins$$anonymous$$d I would like to not use rotation but a new coordinate system. With other words I would like to rotate the coordinate system of my virtual robot object ins$$anonymous$$d of rotating only the object with respect to the main cams coord system. That would be a solution for the whole issue i think. Is this possible? EDIT: with rotation of the coord system, I mean that e.g. turn it from a left handed to a right handed. (rotating the axes) e.g. the x-axis of the old one is now the z-axis of the new one

EDIT: I tried some things out with parenting like you suggested and somehow it worked! I will do some more test and report in detail later!