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add belt docs and preserve belt transformations

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This commit is contained in:
Stewart Allen 2026-01-10 12:33:40 -05:00
commit dce90fab07
1 changed files with 31 additions and 5 deletions
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36
src/kiri/mode/fdm/work/prepare.js
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@ -493,15 +493,25 @@ export async function fdm_prepare(widgets, settings, update) {
} }
} }
// establish offsets /**
* Establish widget offsets
*
* For belt printers: Apply trigonometric transformation from Y-axis position
* to inclined belt coordinate system using widget.belt properties (cosf, sinf, ypos)
*
* For normal printers: Use widget position plus any raft offset
*
* Note: This must run BEFORE support widgets are created, as they inherit
* both the offset and belt properties from their parent widget.
*/
for (let widget of widgets) { for (let widget of widgets) {
let { belt } = widget; let { belt } = widget;
let offset = Object.clone(widget.track.pos); let offset = Object.clone(widget.track.pos);
if (isBelt) { if (isBelt) {
offset = { offset = {
x: belt.xpos, x: belt.xpos,
y: belt.ypos * belt.cosf, y: belt.ypos * belt.cosf, // Y component of inclined belt
z: belt.ypos * belt.sinf z: belt.ypos * belt.sinf // Z component of inclined belt
}; };
} else { } else {
// when rafts used this is non-zero // when rafts used this is non-zero
@ -510,12 +520,27 @@ export async function fdm_prepare(widgets, settings, update) {
widget.offset = offset; widget.offset = offset;
} }
// for any widget with supports, create a new widget for them /**
* Extract support structures into separate synthetic widgets
*
* Support structures use a different extruder (sliceSupportNozzle) and need
* to be processed independently. This creates new "virtual" widgets containing
* only support geometry.
*
* CRITICAL for belt mode: Must copy belt properties to maintain proper positioning
* - widget.belt: Required for offset calculations if widget list is reprocessed
* - slice.belt.anchor: Used to mark layers that touch the belt (line 667)
* - slice.belt.touch: Affects print start position logic (line 676)
*
* Without belt property copying, supports render in incorrect positions because
* the belt coordinate transformations (cosf, sinf, ypos) are not applied.
*/
for (let widget of widgets.slice()) { for (let widget of widgets.slice()) {
let slices = []; let slices = [];
for (let slice of widget.slices) { for (let slice of widget.slices) {
if (slice.supports) { if (slice.supports) {
let nslice = newSlice(slice.z); let nslice = newSlice(slice.z);
nslice.belt = slice.belt;
nslice.height = slice.height; nslice.height = slice.height;
nslice.index = slice.index; nslice.index = slice.index;
nslice.supports = slice.supports; nslice.supports = slice.supports;
@ -527,7 +552,8 @@ export async function fdm_prepare(widgets, settings, update) {
let nwid = newWidget(null, widget.group); let nwid = newWidget(null, widget.group);
nwid.support = true; nwid.support = true;
nwid.slices = slices; nwid.slices = slices;
nwid.offset = widget.offset; nwid.offset = widget.offset; // inherit calculated offset from parent
nwid.belt = widget.belt; // inherit any belt transformations
widgets.push(nwid); widgets.push(nwid);
} }
} }