forked from bartvdbraak/blender
011327224e
This commit adds a new face nearest snapping mode, adds new snapping options, and (lightly) refactors code around snapping. The new face nearest snapping mode will snap transformed geometry to the nearest surface in world space. In contrast, the original face snapping mode uses projection (raycasting) to snap source to target geometry. Face snapping therefore only works with what is visible, while nearest face snapping can snap geometry to occluded parts of the scene. This new mode is critical for retopology work, where some of the target mesh might be occluded (ex: sliding an edge loop that wraps around the backside of target mesh). The nearest face snapping mode has two options: "Snap to Same Target" and "Face Nearest Steps". When the Snap to Same Object option is enabled, the selected source geometry will stay near the target that it is nearest before editing started, which prevents the source geometry from snapping to other targets. The Face Nearest Steps divides the overall transformation for each vertex into n smaller transformations, then applies those n transformations with surface snapping interlacing each step. This steps option handles transformations that cross U-shaped targets better. The new snapping options allow the artist to better control which target objects (objects to which the edited geometry is snapped) are considered when snapping. In particular, the only option for filtering target objects was a "Project onto Self", which allowed the currently edited mesh to be considered as a target. Now, the artist can choose any combination of the following to be considered as a target: the active object, any edited object that isn't active (see note below), any non- edited object. Additionally, the artist has another snapping option to exclude objects that are not selectable as potential targets. The Snapping Options dropdown has been lightly reorganized to allow for the additional options. Included in this patch: - Snap target selection is more controllable for artist with additional snapping options. - Renamed a few of the snap-related functions to better reflect what they actually do now. For example, `applySnapping` implies that this handles the snapping, while `applyProject` implies something entirely different is done there. However, better names would be `applySnappingAsGroup` and `applySnappingIndividual`, respectively, where `applySnappingIndividual` previously only does Face snapping. - Added an initial coordinate parameter to snapping functions so that the nearest target before transforming can be determined(for "Snap to Same Object"), and so the transformation can be broken into smaller steps (for "Face Nearest Steps"). - Separated the BVH Tree getter code from mesh/edit mesh to its own function to reduce code duplication. - Added icon for nearest face snapping. - The original "Project onto Self" was actually not correct! This option should be called "Project onto Active" instead, but that only matters when editing multiple meshes at the same time. This patch makes this change in the UI. Reviewed By: Campbell Barton, Germano Cavalcante Differential Revision: https://developer.blender.org/D14591
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