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tomslice

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  • First Name
    Tom
  • Last Name
    James
  • C4D Version
    R18 Demo
  1. Hi, I guess that was all a bit TL;DR :) Short version, in case anyone can see what I'm trying to do when I cut through the fluff: I want to create a sweep/lofted volume that essentially lofts together a rectangle on each vertex of a camera path, with the rectangle taking on the rotation values at each point, not just being perpendicular to the spline. Is this possible with any combination of Loft/sweep/spline wrap generators and rail splines, or can it be done with Xpresso? These two videos show the exact effect I am looking for: Essentially I need the textured camera volume, that I can animate the growth of, with end caps that I can turn on and off, as well as the animated film plane that I can animate moving through the whole volume (i.e. at 100% growth) Here is a project file of my attempts so far: https://www.dropbox.com/sh/0rsit6wuklx8j3t/AACVRFOraErX_I5l-L9NErsna?dl=0 Apologies if this is not the correct etiquette - please let me know what the best way to share is! Thanks, Tom --------------------------------------- Hello all I've been lurking here for a few months, picking up bags of great tips, but have come up against something that I've not found anyone else doing, so would like to ask the experts directly! Thanks in advance. I'm an architecture student who's been using film and filmic techniques to investigate new ways of designing. For the past few weeks I've been looking at filmic space and time and the way time and space are represented in film. I've been investigating how both are encoded through the act of filming, and I'm now trying to extract this information from existing films, and see what this can tell us about camera moves and representation of space. Phew...intro over - and if anyone has any insights on this and would like to contact me for further discussion, please do! I am newish to C4D but have got to grips with the basics, but I'm now coming up against the limits of my abilities, and would appreciate help on trying to solve a particular problem. I wanted to attach a scene file but it's too big, even without the animated textures, so they are here: https://www.dropbox.com/sh/0rsit6wuklx8j3t/AACVRFOraErX_I5l-L9NErsna?dl=0 Apologies if this is not the correct etiquette - please let me know what the best way to share is! Using the C4D motion tracker I have solved a camera path, such that I have a position and rotation value for each frame. I then parented a plane to the camera of the same aspect ratio as the film 1480*1080, and assigned it an animated texture of the film clip so it plays as I play the scene. So far so good. What I want to do next is create a volume that represents this movement perfectly, exactly like these guys did with this project, 'The invisible shape of things past' https://artcom.de/en/project/the-invisible-shape-of-things-past/ (Scroll through the images to see what they have done - it's lovely!) These two videos show the exact effect I am looking for: Essentially I need the textured camera volume, that I can animate the growth of, with end caps that I can turn on and off, as well as the animated film plane that I can animate moving throught the whole volume (i.e. at 100% growth) The textured faces of the volume can be generated using a slit scan method using a Processing script, and I have these already saved as a tif ready for texturing if that is the way to go. I feel like this MUST be possible in C4D and I keep getting close but not quite there. As usual in Cinema, there are several ways to go about something and I have tried: 1. lofting rectangles cloned onto the spline's vertices, and texturing with my texture wrap 2. a spline wrap to deform a textured cube along the camera path spline 3. A sweep using the camera path, with caps assigned the animated texture using the C1, C2 designation 4. A sweep using a baked tracer genrator of the vertices of the film plane mentioned earlier, using one as a path and the one on the opposite side as a rail This last one gets me closest, at least I can make it look nearly right, most of the time, but it's a bit of a hack, as it's only using rotation in one dimension - HEADING - and thus always appears perpendicular to the camera track, which is not how it really behaves. The problem with all of these is that they are only using the position info from a spline, not the rotation of the plane at each point! For simple camera moves they sort of work, but for more difficult ones that bob all over the place like the 'Invisible shape of things past' clip, the sweep/wrap/loft tends to just start inverting and twisting all over the place. My intuition is that there might be an Xpresso-based solution, and I tried a few approaches using the Memory operator and point node I think (it was a couple of weeks ago now :), to draw a cube without its front and back faces (so a square tube) between the four corners (global position) of two successive frames of the animated film plane, that is parented to the camera. This looked promising, but I couldn't work out how to iterate through it properly, and have it animate growing like a sweep would. So in essence, I want the behaviour of a sweep where I can animate it growing, though I know I might be able to replicate this using Mosplines in a different generator. Another reason the sweep doesn't work ideally is that, particularly for shots where the camera speeds up and slows down, the film plane doesn't line up exactly with the point on the volume where it should (even if linear interpolation on the sweep growth is used). This is because the segments of the sweep are different lengths, whereas the texture is applied to the UVs linearly. For this reason, deforming a cube subdivided into the correct number of segments and spline wrapping it works best, as it stretches each segment the right amount. Sorry for the long read, but if anyone has the time and inclination to help out I'd be really grateful, as it's starting to get some beautiful and interesting results. BTW, the scene mesh is generated elsewhere by using Structure from motion/photogrammetry, and feeding it stills from the film clip. Thank you all!
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