Leaderboard

Very Important Read the following update to this thread, before reading any further into this post: It appears that there are serious bugs in the Line Cut tool in the current version when the tool is used in a Perspective View to make cuts that connect points across multiple polygons. I have not noticed this type of (mis)behavior in prior versions, assuming that the tool was used properly and that the geometry it was used on was not malformed, of course. The following scene segment is a relatively minimal excerpt from a more complex scene that will be used to demonstrate an instance of the issues encountered while using the tool in the context described in the first paragraph. Starting State and Background Info The intent of the following scene object fragment is for it to be extended using four way Symmetry (i.e., along X and Z axes) to ultimately create a solid shape (once a ceiling and floor also get added). However, as you can see illustrated by the Mesh Checker, we presently have some triangles and "ugly" poles that are present in the starting geometry. To take the first step towards removing these, line cuts around the poles will be made to split up some polygons and connect the SDS support edges of the top vertical column quarter-portion with the foundational column quarter-portion. I should add that the ledge that connects the two columns, upper and lower (which themselves only contain polygons that are vertical [i.e., parallel to either the yz-plane or the xy-plane]), is horizontal and parallel to the ground (i.e., the xz-plane), since these properties may not be intuitive due to the perspective angle that is used. Information about the world coordinates of all points that make up the object's geometry, bearing in mind that the object's axis is located at the origin, will be shown in the images that follow. Notes: - The scene consists of a sole polygonal object named Cube.1 - We are looking at it in a Perspective Viewport (with the editing mode set to Edge mode) - All geometry that is present in the scene is shown in the above image - - There is no bad geometry present and everything that is present is shown, specifically: - No isolated points - No coincident points - No points that are very close (i.e., nearly coincident points that Optimize would remove/weld) - No partially or fully overlapping edges - No partially or fully overlapping polygons - No non-manifolds (any two polygons share at most one edge and each edge connects no more than two polygons) - No "bad" (i.e., degenerate) polygons - No N-Gons are present (yet!) - There are no rear facing polygons in this scene - all normals are properly aligned and face in a direction that is at least partially towards the camera. I did not want to obfuscate the image and make it more complex by enabling vertex/polygon normal line visibility and in any case, this information, at least for the polygons, is implicit in the polygon point order shown in the Structure Manager. - There is no hidden geometry - "what you see is what is there." Update: I have decided to include a small image explicitly showing all point and edge normals, as well as all polygon facing directions (via color), in case this info happens to be of relevance. Since I deem this to be largely inconsequential (as long as it is as described with regard to there being to back-facing polygons), it will not be present in any other images that follow, so as not to obscure any far more relevant details that are shown in said images: Preview of Corrected Topology Before proceeding with the steps of the first cut, I would like to present as a detailed zoomed-in illustration, the final desirable corner topology that is being worked towards via the cut operations that will be performed: I should note that only the first simple cut will actually be shown, since we immediate run into the buggy behavior that is the subject of this post. Initiation of the First Line Cut I have zoomed in on the object somewhat and have also created (and activated) a Perspective Camera (which I have unimaginatively called Camera), so that I can include all of the relevant coordinate info about the viewpoint from which the object is being viewed as well as various other camera settings (e.g., zoom, field of view, etc.), as we initiate our cut. All of this info along with additional info that include the Cube.1 object's geometry as reported by the Structure Manager will be superimposed on the viewport image that follows. We will start with a a simple linear cut to connect Point #14 to Point #10 (these points have been labeled in the image below), using the best tool for the job, the Line Cut tool. The initiation of the cut is shown in the following image where we have performed the following set of steps: 1. In a Perspective View, we select the Cube.1 object and switch the scene editing mode to Edge Mode 2. Using the Brush Selection tool, points #14 and #10 are selected (optional step to match the image shown below). There are no other selections present 3. We then set the active tool to be the Line Cut tool (i.e., <k>-<k> shortcut combo) Note: Scene-wide snaps are presently disabled (see the partial snapshot of the toolbar in the top right corner of the image), so as not to conflict with the Auto Snap functionality of the Line Cut tool, which will be enabled The remaining additional Line Cut tool properties presently set are as shown in the image (bottom right corner - "Line cut settings:") 5. We click on Point #14 to initiate the cut and subsequently click on Point #10 to complete the cut. Note: I will show multiple Snapshots of the Structure Manager both pre-cut and post-cut, so that all of the details with regard to the Cube.1 object's make-up are explicit. Because the Line Cut tool has been set to Single Line mode, no further actions will be necessary and our cut operation is complete. Resulting Aberrant Geometry As we complete the aforementioned cut operation, we see the following erroneous result: ..., and there in lies the issue. The Line Cut tool did not stop its cut at Point #10, as instructed. It performed some additional seemingly random cutting along the path of the cut line. It behaved in a way that is similar (but not identical) to what would have happened if the Infinite Cut property of the Line Cut tool had been set. Furthermore, if we perform the exact same cut, but with the Single Line property unchecked, causing the Infinite Cut property to be grayed out since this type of cut would no longer be possible or applicable, we get exactly the same cut and geometry as shown in the above image (i.e., this has nothing to do with Infinite Cut as far as I can tell, it just looks similar in that the cut continues along the direction of cut, erroneously cutting other polygons of the object [and then some!]). I will be somewhat busy for the next several days as the year comes to a close, but feel free to ask any questions regarding state or steps not present in the above description. I have done my best to be quite thorough and omit no information that may be of relevance in troubleshooting the bug. Although I cannot include the original scene file (or even the excerpt shown), I believe all info need to reproduce this is in the body of this text. If I have omitted anything of value or relevance, I will do my best to provide it as an update to this message. Addendum I decided to include an additional test I performed using the more complex geometry that was shown previously as the final desired topology for the corner. The test was to do a simple cut of one of the quads present near the middle of the object, simply to cut it in half (i.e., into two triangles). Specifically, I decided to try to connect the following selected pair of points with a single cut through the single polygon that they are the corners of, cutting from the top right point to the bottom left using the exact same Line Cut settings that were previously used. Let's start with a view showing the entire topological structure of the object, both with and without a Subdivision Surface generator applied to it (Note: The object has a bottom face that is obscured by the view. It looks similar, topologically, to its top face. Also of note is that the object has no back face (and lacks the corresponding control edges along its farthest [i.e., maximal Z+] edges), since it is actually the front half of an object that is intended to be used with an xy-aligned Symmetry Generator to form a complete solid object): Original: , with SDS: The initial state showing the two points that are the bounds of the cut being performed: Just before clicking on the bottom left point to complete the cut, being very careful not to move the mouse during either click, so as not to lose Line Cut tool vertex snap: : The resulting mess, post cut (shown higher-res for added detail of the resulting topology): In the next image, I zoomed out to show the entirety of the object once again, but this time, post cut. (Note: The obscured bottom face was not altered in any way by the cut): So, there you have it - don't know what else to add. Updates and Clarifications Reserved - will be entered into this top post based on replies, as they arise...

This is heaps of info and will hopefully be enough for Maxon to get it sorted. Thanks for the info.

Important Update: The issue only impacts a seemingly seldom used camera type in Perspective mode. This issue is far more isolated and therefore less serious than I initially thought. As far as I can tell as of right now, it only affects the use of a Spherical Camera in a Perspective View, which is not the default setting. For further details, read the following update to the thread presenting the nature of the issue: I don't want to derail this thread and take it off-topic. Therefore, I have created a new thread (and did so in the appropriate [Cinema 4D] sub-forum of the site, rather than this sub-forum which is intended for posts associated with News) to both describe and illustrate the issues that were encountered while using the Line Cut tool. You can view the full info by clicking on the link/image, below, to view the new post:

The Line Cut tool when used to cut across several polygons in a Perspective view is very broken in the latest version of C4D 2023! I don't know in specifically which release the bug "was born," but I am going to post more details with a minimal test scene to demonstrate the bug(s), in a little bit.

Your file was a bit heavy for my machine so I have had to take out a few things and also turn the petals off and the shell down to 2 clones. I also dont have field fall off in R18 so Im using a linear falloff here. Ive copied in your original flower and put that in the cloner, I think maybe where you were going wrong is having the cloner set to "play" in the transform tab Im not great with mograph but I think when you set that to fixed you enable the plain effector to then start the animation, also in the plain effector you need to put a frame offset thats equal to or greater than the length of your original animation. Also I deleted the turbulence from the flower as I dont think its best practice to clone that. Stripped down file below, had to delete textures and other stuff to make it fit here. Deck Frame set_06 falloff.c4d