Handle failure when 3D mode fails for histogram

When 3D rendering fails - at least continue with default 2D renering to keep code working

Author: linev

modules/hist/TH1Painter.mjs

@@ -11,7 +11,7 @@ import { TH1Painter as TH1Painter2D } from '../hist2d/TH1Painter.mjs';
 class TH1Painter extends TH1Painter2D {
 
    /** @summary draw TH1 object in 3D mode */
-   draw3D(reason) {
+   async draw3D(reason) {
       this.mode3d = true;
 
       const main = this.getFramePainter(), // who makes axis drawing

modules/hist2d/TH1Painter.mjs

@@ -1294,17 +1294,6 @@ class TH1Painter extends THistPainter {
       return false;
    }
 
-   /** @summary Call drawing function depending from 3D mode */
-   async callDrawFunc(reason) {
-      const main = this.getMainPainter(),
-            fp = this.getFramePainter();
-
-     if ((main !== this) && fp && (fp.mode3d !== this.options.Mode3D))
-        this.copyOptionsFrom(main);
-
-      return this.options.Mode3D ? this.draw3D(reason) : this.draw2D(reason);
-   }
-
    /** @summary Performs 2D drawing of histogram
      * @return {Promise} when ready */
    async draw2D(reason) {
@@ -1332,6 +1321,24 @@ class TH1Painter extends THistPainter {
       return this.draw2D(reason);
    }
 
+   /** @summary Call drawing function depending from 3D mode */
+   async callDrawFunc(reason) {
+      const main = this.getMainPainter(),
+            fp = this.getFramePainter();
+
+      if ((main !== this) && fp && (fp.mode3d !== this.options.Mode3D))
+         this.copyOptionsFrom(main);
+
+      if (!this.options.Mode3D)
+         return this.draw2D(reason);
+
+      return this.draw3D(reason).catch(() => {
+         console.error('Fail to draw histogram in 3D - back to 2D')
+         this.options.Mode3D = false;
+         return this.draw2D(reason);
+      });
+   }
+
    /** @summary Redraw histogram */
    redraw(reason) {
       return this.callDrawFunc(reason);

modules/hist2d/TH2Painter.mjs

@@ -3542,10 +3542,17 @@ class TH2Painter extends THistPainter {
       const main = this.getMainPainter(),
             fp = this.getFramePainter();
 
-     if ((main !== this) && fp && (fp.mode3d !== this.options.Mode3D))
-        this.copyOptionsFrom(main);
+      if ((main !== this) && fp && (fp.mode3d !== this.options.Mode3D))
+         this.copyOptionsFrom(main);
 
-      return this.options.Mode3D ? this.draw3D(reason) : this.draw2D(reason);
+      if (!this.options.Mode3D)
+         return this.draw2D(reason);
+
+      return this.draw3D(reason).catch(() => {
+         console.error('Fail to draw histogram in 3D - back to 2D')
+         this.options.Mode3D = false;
+         return this.draw2D(reason);
+      });
    }
 
    /** @summary Redraw histogram */