fantomaz Posted January 29, 2014 Report Share Posted January 29, 2014 Hi gang :shy: I ran into a problem: Imagine there is a cylinder made of glass (a sort of tube), my camera is inside this tube and travels through this tube over time. Now i want to project (films) images on the inside of that tube, that are traveling with my main camera (parent/child). My first thought: this is a job for camera mappings! Works well so far, but... When i made the material of that tube transparent, my projected movie on the wall is also transparent :( . Is there any other idea to get the tube transparent (glass) and the part of the tube, where the image is projected on the tube, is NOT transparent? Thanks in advance Alex Test project Quote Link to comment Share on other sites More sharing options...
Tomas Egger Posted January 29, 2014 Report Share Posted January 29, 2014 Ola Alex! Why you don't render in the passes and compose? one Transparent and another only with the projections? Thanks Tom Quote Link to comment Share on other sites More sharing options...
fantomaz Posted January 29, 2014 Author Report Share Posted January 29, 2014 Hm, good point, thinking and trying :idea: Quote Link to comment Share on other sites More sharing options...
S. Houtzager Posted January 29, 2014 Report Share Posted January 29, 2014 Does the bend of this tunnel change in any way? Quote Link to comment Share on other sites More sharing options...
fantomaz Posted January 30, 2014 Author Report Share Posted January 30, 2014 Quote: Why you don't render in the passes and compose? one Transparent and another only with the projections? Rendered the drive through of the transparent tube - works well (of course). Tried to render the drive through with the camera map but don't get the rest of the tube transparent/invisible. In other words: When using camera maps i don't get the other part of the tube transparent/invisible, hmmmmm... ....how can i do it? Is there a setting i am missing some how when using the camera map? Its not like using a normal texture map, where you can have an alpha channel to mask the rest. --- Quote: Does the bend of this tunnel change in any way? Yes, its a long tube like a snake and the camera is driving in the inside from the start to the end of that tube. My example is only an example :shy: , in the real project the tube is much longer and curvier... Alex Quote Link to comment Share on other sites More sharing options...
RichardJoly Posted January 31, 2014 Report Share Posted January 31, 2014 A glass tunnel… In the transparent part of the tube, do we see outside? What is outside? Does the projection covers all the inside of the tube/tunnel or equally spaced screens like billboards along an autobahn? Can you post a sketch or a still example of what you want to accomplish, I don't think I really understand what the final product should look like. Quote Link to comment Share on other sites More sharing options...
fantomaz Posted January 31, 2014 Author Report Share Posted January 31, 2014 Yes, a glas tunnel, thats the right word :shy: Yes, we see through the glas, the background is full with stars, like the milky way. And yes, is like billboards along the autobahn but the billboards are traveling with the camera - the projected pictures/movies don't cover the whole tube, only parts of it. One idea of mine is: model a small part of the tube with the correct rounding and project the movies/pictures on that part. Together with the projecting camera i move the small part of that tube along the path of the main camera. The only problem is in strong curves, there is a chance to see, that the projection is not on the original tube. But maybe Contortionist can help me here :idea: Alex Quote Link to comment Share on other sites More sharing options...
RichardJoly Posted January 31, 2014 Report Share Posted January 31, 2014 I'm trying something... Like the big guy said "I'll be back"... Quote Link to comment Share on other sites More sharing options...
fantomaz Posted January 31, 2014 Author Report Share Posted January 31, 2014 Nearly success - with my above described method. Only a few timing and matching problems. I did a simple plane (16:9 for the correct size of the videos i will project), deformed it to a quarter pipe in the dimensions of the tube. On this plane its easy to glue the texture :shy: - no camera map is needed. But the camera mapping is/would be more precise.... (ok, there is always 'something' ;) ). And at last: moved it along the path for the main camera with the help of Contornionist for the correct deforming along the tube. As i said above: only minor problems with speed and exact placement, but since the tube is nearly full transparent, no one will see this. But maybe Richard has a better method, lets see :) Alex PS: thanks for your 'rolling stones' that let my mind started to look in an other direction :D - - - - - - - - EDIT: Doesn't look as i wanted it to look :( But i have an other idea for that shot :shy: I will report.... Quote Link to comment Share on other sites More sharing options...
RichardJoly Posted February 6, 2014 Report Share Posted February 6, 2014 Better late than never… Could not find my original tunnel animation so I did this crude one to illustrate the concept. The timing is not right but you will get the idea… You can animate a moving map simulating the moving tunnel and easily keep your screens where you want them. The curves in the tunnel are obtained with animated deformations. The trick is to time the animations to get the speed you want. You could try with EXR2Mesh and get actual polygons moving instead of a simple image… I uploaded the project so you can play with it. Some movies are missing because they are not mine. Glass tunnel.mov Project Glass tunnel.zip Quote Link to comment Share on other sites More sharing options...
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