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3D parametric surface with type 'colorarray'
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<iframe 
    src="https://jsxgraph.org/share/iframe/3d-parametric-surface-with-colorarray" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: 3D parametric surface with type 'colorarray'" 
    allowfullscreen
></iframe>
This code has to 
<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-8, 8, 8, -8],
        keepaspectratio: true,
        axis: false,
        zoom: { enabled: true },
        pan: { enabled: false }
    });
    
    var view = board.create('view3d',
    		    [
    		        [-6, -3], [8, 8],
    		        [[-5, 5], [-5, 5], [-5, 5]]
    		    ],
        {
            projection: 'central',
            axesPosition: 'center'
        });
    
    var F = (x, y) => 0.5 * Math.abs(y * x) - 4.5;
    
    var c = view.create('functiongraph3d', [
    		            F,
    		            [-4, 4],
    		            [-4, 4],
    		        ], {
        tiling: 'triangle',
        stepsU: 26,
        stepsV: 26,
        type: 'colorarray', // 'wireframe', 'shader', 'colormap', 'colorarray'
    
        polyhedron: {
            strokeWidth: 0.5,
            fillOpacity: 0.7,
    
            // Colors for 'colorarray':
            fillColorArray: ['white', JXG.palette.blue, JXG.palette.red]
        }
    });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-8, 8, 8, -8],
    keepaspectratio: true,
    axis: false,
    zoom: { enabled: true },
    pan: { enabled: false }
});

var view = board.create('view3d',
		    [
		        [-6, -3], [8, 8],
		        [[-5, 5], [-5, 5], [-5, 5]]
		    ],
    {
        projection: 'central',
        axesPosition: 'center'
    });

var F = (x, y) => 0.5 * Math.abs(y * x) - 4.5;

var c = view.create('functiongraph3d', [
		            F,
		            [-4, 4],
		            [-4, 4],
		        ], {
    tiling: 'triangle',
    stepsU: 26,
    stepsV: 26,
    type: 'colorarray', // 'wireframe', 'shader', 'colormap', 'colorarray'

    polyhedron: {
        strokeWidth: 0.5,
        fillOpacity: 0.7,

        // Colors for 'colorarray':
        fillColorArray: ['white', JXG.palette.blue, JXG.palette.red]
    }
});
<jsxgraph width="100%" aspect-ratio="1 / 1" title="3D parametric surface with type 'colorarray'" description="This construction was copied from JSXGraph examples database: BTW HERE SHOULD BE A GENERATED LINKuseGlobalJS="false">
   /*
   This example is licensed under a 
   Creative Commons Attribution ShareAlike 4.0 International License.
   https://creativecommons.org/licenses/by-sa/4.0/
   
   Please note you have to mention 
   The Center of Mobile Learning with Digital Technology
   in the credits.
   */
   
   var board = JXG.JSXGraph.initBoard(BOARDID, {
       boundingbox: [-8, 8, 8, -8],
       keepaspectratio: true,
       axis: false,
       zoom: { enabled: true },
       pan: { enabled: false }
   });
   
   var view = board.create('view3d',
   		    [
   		        [-6, -3], [8, 8],
   		        [[-5, 5], [-5, 5], [-5, 5]]
   		    ],
       {
           projection: 'central',
           axesPosition: 'center'
       });
   
   var F = (x, y) => 0.5 * Math.abs(y * x) - 4.5;
   
   var c = view.create('functiongraph3d', [
   		            F,
   		            [-4, 4],
   		            [-4, 4],
   		        ], {
       tiling: 'triangle',
       stepsU: 26,
       stepsV: 26,
       type: 'colorarray', // 'wireframe', 'shader', 'colormap', 'colorarray'
   
       polyhedron: {
           strokeWidth: 0.5,
           fillOpacity: 0.7,
   
           // Colors for 'colorarray':
           fillColorArray: ['white', JXG.palette.blue, JXG.palette.red]
       }
   });
</jsxgraph>
Possible types for representing parametric surfaces are: - `'wireframe'`, - `'shader'`, - `'colormap'`, - `'colorarray'` Here is an example for `'colorarray'`. Internally, the color array is realized with a `polyhedron3d` element. The visual attributes are set inside of the `polyhedron` sub-attribute.
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-8, 8, 8, -8],
    keepaspectratio: true,
    axis: false,
    zoom: { enabled: true },
    pan: { enabled: false }
});

var view = board.create('view3d',
		    [
		        [-6, -3], [8, 8],
		        [[-5, 5], [-5, 5], [-5, 5]]
		    ],
    {
        projection: 'central',
        axesPosition: 'center'
    });

var F = (x, y) => 0.5 * Math.abs(y * x) - 4.5;

var c = view.create('functiongraph3d', [
		            F,
		            [-4, 4],
		            [-4, 4],
		        ], {
    tiling: 'triangle',
    stepsU: 26,
    stepsV: 26,
    type: 'colorarray', // 'wireframe', 'shader', 'colormap', 'colorarray'

    polyhedron: {
        strokeWidth: 0.5,
        fillOpacity: 0.7,

        // Colors for 'colorarray':
        fillColorArray: ['white', JXG.palette.blue, JXG.palette.red]
    }
});

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.