Build with TCanvas support in build3d

Author: linev

build/jsroot.js

@@ -14,7 +14,7 @@ const version_id = 'dev',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '24/11/2025',
+version_date = '25/11/2025',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}
@@ -91042,6 +91042,20 @@ class TCanvasPainter extends TPadPainter {
       this.getWebsocket()?.resizeWindow(fullW, fullH);
    }
 
+   /** @summary create three.js object for TCanvas */
+   static async build3d(can, opt, get_painter) {
+      const painter = new TCanvasPainter(null, can, opt, true);
+      painter.checkSpecialsInPrimitives(can, true);
+
+      const fp = new TFramePainter(null, null);
+      // return dummy frame painter as result
+      painter.getFramePainter = () => fp;
+
+      return painter.drawPrimitives().then(() => {
+         return get_painter ? painter : fp.create3DScene(-1, true);
+      });
+   }
+
    /** @summary draw TCanvas */
    static async draw(dom, can, opt) {
       const nocanvas = !can;
@@ -91313,6 +91327,11 @@ class TPavePainter extends ObjectPainter {
             opt = this.getPaveDrawOption().toUpperCase(),
             fp = this.getFramePainter(), pp = this.getPadPainter(),
             pad = pp.getRootPad(true);
+
+      // special handling of dummy frame painter
+      if (fp?.getDrawDom() === null)
+         return this;
+
       let interactive_element, width, height;
 
       if (pt.fInit === 0) {
@@ -169359,6 +169378,11 @@ class TTextPainter extends ObjectPainter {
             pp = this.getPadPainter(),
             fp = this.getFramePainter(),
             is_url = text.fName.startsWith('http://') || text.fName.startsWith('https://');
+
+      // special handling of dummy frame painter
+      if (fp?.getDrawDom() === null)
+         return this;
+
       let fact = 1, use_frame = false;
 
       this.createAttText({ attr: text });

changes.md

@@ -2,9 +2,10 @@
 
 
 ## Changes in dev
-1. Resort order of ranges in http request, fixing several problems #374
+1. Resort order of ranges in http request, fixing several long-standing problems #374
 1. Implement for `TPie` 3d, text, title drawing including interactivity
-1. Remove support for deprectaed TH1K class
+1. Implement `TCanvas` support in `build3d` function #373
+1. Remove support for deprectaed `TH1K` class
 1. Fix - proper paint axis labels on both sides when pad.fTickx/y = 2
 1. Fix - paint frame border mode/size from TCanvas
 

modules/core.mjs

@@ -6,7 +6,7 @@ const version_id = 'dev',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '24/11/2025',
+version_date = '25/11/2025',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}