Display colors when rendering using F6

[kintel]

Currently, color() can be used to set the color of (both negative and positive) objects, but only works in Preview Mode (F5).

Example:

difference() {
    union() {
      color("darkred") cube(20);
      color("darkgreen" ) sphere(10);
    }
    color("cyan") cylinder(r=8, h=30);
}

It would be great if this was extended to also support Render Mode (F6).

Using Manifold, this should be possible, as demoed by https://manifoldcad.org/#Tetrahedron%20Puzzle.
This feature is likely a generalization of #5047

Further topics related to this could be:

• Extend color support to allow importing and exporting objects with color information
  • Export color models #4311
  • [color(), material() and part() color(), material() and part() [$325] #1608(https://github.com/color(), material() and part() [$325] #1608)
  • Allow colours in SVG export #1364

When investigating this, it could be beneficial to look at the following related issues:

• Hierarchically inherit colors #366
• Preserve original colors of minuend objects that are cut with difference() #4798
• Color ignored by linear_extrude #3621
• Feature request: edge colours to affect preview/animation #3393
• Feature request: shaders #3198
• Add color, linecolor, and line width parameters to projection. #2145
• color overrides transparency #1393
• Difference applies color of removed object to interface #501
• Hierarchical color() behavior #492
• Hierarchically inherit colors #366

[gsohler]

My work on that is stuck currently, as the order of the input sets described in runIndex is not predictable for me in my place even documentation states, that they are sorted by originalID. sometimes their order is A, B, sometimes th eorder is B,A and I did not follow the approach by matching the sets by triangle count ;) hope to get the right inspiration soon. ps the example given matching by triangle count would work well as its unlikely that green, blue and red have same counts.

…

On Sun, Mar 24, 2024 at 6:43 PM Marius Kintel ***@***.***> wrote: Currently, color() can be used to set the color of (both negative and positive) objects, but only works in Preview Mode (F5). Example: difference() { union() { color("darkred") cube(20); color("darkgreen" ) sphere(10); } color("cyan") cylinder(r=8, h=30); } Screenshot.2024-03-24.at.13.34.52.png (view on web) <https://github.com/openscad/openscad/assets/186094/aa3be768-0531-4a60-9cac-d563857b7484> It would be great if this was extended to also support Render Mode (F6). Using Manifold, this should be possible, as demoed by https://manifoldcad.org/#Tetrahedron%20Puzzle. This feature is likely a generalization of #5047 <#5047> — Reply to this email directly, view it on GitHub <#5065>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACCO4MRFLS77FS7RVL6UJYDYZ4GE5AVCNFSM6AAAAABFF3WA6SVHI2DSMVQWIX3LMV43ASLTON2WKOZSGIYDINBXGI4DONA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[kintel]

Any dependency on implicit ordering is likely to fail, as is any dependency on likely triangle count of child nodes. Why not just map from originalID, as these IDs are already available in MeshGL?

[yahbluez]

Would like to see that feature too.