Create Gradient Mesh and a Mesh tool click estimated each border edge's
handles from the surface's derivatives, so the mesh's border cut across a
curved outline: a 1x1 mesh over a 400 x 300 pt ellipse came out up to
7 pt off it, with corners at its four mesh points. Each border edge now
takes the handles of the cubic that best fits the outline between its
points, and handles where two border edges meet along a side stay
collinear.
Deleting a mesh line (Alt-click with the Mesh tool) joined the two edges
on either side with a straight line, which turned the ellipse's border
into a diamond. The joined edge now keeps the outer handles, grown back
to the length they had before the line split the edge.
locate_within maps a point outside the outline to the nearest point of the outer edges, so a patch folded past the outline does not take an edge click as an interior one.
A Mesh tool click within the hit tolerance outside a gradient mesh hit the
mesh, but object.mesh.addLine looked for the point inside the outline only
and failed with "point is outside the mesh". The same click on a path's edge
made a 1x1 mesh without the line.
- GradientMesh::locate_within takes a tolerance: a point outside the mesh
within it of the outline gives the nearest point of the edge.
- object.mesh.addLine and object.mesh.create take an optional `tolerance`
(0 by default), and the Mesh tool sends its hit tolerance.
Each patch of a gradient mesh was cut into 8 x 8 flat quads for SVG export,
Object > Expand and the other outputs that cannot shade a mesh, whatever its
colours, so a patch of one colour became 64 identical pieces. Neighbouring
quads are now joined into square blocks wherever the colour changes by no
more than about one 8-bit step across the block; the block's outline runs
through its quads' corners, and a patch that folds over itself is not joined.
A mesh read from a file can have any number of patches, and the view any zoom: a 150 x 150 mesh from a 3 MB file exported at 20x asked for about 23 million quads (2 GB), and the command's own cap of 50 rows and columns does not apply to a loaded one. One tessellation now makes at most 1,048,576 quads, the subdivision per patch giving way before that, and a mesh with more patches than that is malformed, like a point count that does not fit.
Create Gradient Mesh's To Center / To Edge highlight lightened every point
towards RGB white, so a CMYK (or grey) point became display RGB. A patch with
any non-CMYK corner then mixes in RGB, and the PDF writer separated those
colours back to CMYK with K = 0, moving ink off the K plate. Points now
lighten towards white in their own colour model (no ink for CMYK), so the
mesh stays CMYK and K shrinks with the other inks. Flat meshes (highlight 0)
already kept their inks.
Envelope Options stored Anti-Alias and Preserve Shape Using, but nothing that
draws an image read them: a distorted image was always smoothed and always
cut into clip groups.
- With Anti-Alias off, each piece of a distorted image is marked pixelated
(saved as `pixelated`). The renderer draws it with nearest-neighbor
sampling and without mips, SVG export writes `image-rendering: pixelated`,
and PDF export writes it without /Interpolate.
- With Preserve Shape Using Transparency, each piece is the image with a
white opacity mask in the piece's shape instead of a clip group. The
renderer paints an image whose mask is one plain white path straight into
that path, as it does for an image in a clip group, when the path lies
inside the image's frame.
Docs: docs/mcp.md, docs/target-app-parity.md.
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