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Avatarsia
689c192a89
Round 2 of performance and correctness improvements: - Spatial grid index for brush painting: forEachTriInSphere now queries only nearby grid cells instead of scanning all triangles. ~5.7x faster for brush operations on 68k+ tri meshes. - Decimation overflow fix: hasLinkViolation used a fixed 0x200000 multiplier for vertex-pair keys, overflowing at >2M vertices. Now uses dynamic multiplier based on actual vertex count. - Decimation determinant threshold: solveQ used absolute 1e-10 which fails for large coordinates. Now relative to matrix element magnitude. - 3MF triangle index validation: bounds-check all parsed indices against vertex count, throw clear error on corrupt files instead of silent NaN. - File size limit: reject files >500 MB before loading into memory, prevents browser tab crash on oversized files. - Accessibility: preset swatches now keyboard-navigable (role=button, tabindex=0, Enter/Space to select). Modal dialogs trap focus and close on Escape. - Ctrl+click straight line tool: click to set start point, Ctrl+click to paint a straight line between points. Ctrl+hover shows preview. - Precision masking available for radius brush mode. - Spatial grid rebuilt when entering/leaving precision mode.