arcgis-custom-rendering

ArcGIS Custom Rendering

Use this skill for creating custom layers, WebGL rendering in 2D/3D, custom tile sources, and post-processing effects in SceneView.

Import Patterns

ESM (npm)

// 3D custom rendering
import RenderNode from "@arcgis/core/views/3d/webgl/RenderNode.js";

// 2D custom rendering
import BaseLayerView2D from "@arcgis/core/views/2d/layers/BaseLayerView2D.js";
import BaseLayerViewGL2D from "@arcgis/core/views/2d/layers/BaseLayerViewGL2D.js";

// Custom layer bases
import BaseTileLayer from "@arcgis/core/layers/BaseTileLayer.js";
import BaseDynamicLayer from "@arcgis/core/layers/BaseDynamicLayer.js";
import BaseElevationLayer from "@arcgis/core/layers/BaseElevationLayer.js";
import Layer from "@arcgis/core/layers/Layer.js";

// Utilities
import esriRequest from "@arcgis/core/request.js";
import Color from "@arcgis/core/Color.js";

CDN (dynamic import)

const RenderNode = await $arcgis.import(
  "@arcgis/core/views/3d/webgl/RenderNode.js",
);
const BaseTileLayer = await $arcgis.import(
  "@arcgis/core/layers/BaseTileLayer.js",
);
const BaseLayerViewGL2D = await $arcgis.import(
  "@arcgis/core/views/2d/layers/BaseLayerViewGL2D.js",
);

Custom Rendering Summary

Class	2D	3D	Typical Use
RenderNode	—	Yes	Post-processing effects in SceneView
BaseLayerView2D	Yes	—	Custom 2D canvas rendering
BaseLayerViewGL2D	Yes	—	WebGL-accelerated 2D rendering
BaseTileLayer	Yes	Yes	Custom tile sources and processing
BaseDynamicLayer	Yes	Yes	On-demand dynamic rendering
BaseElevationLayer	—	Yes	Custom elevation/terrain data

RenderNode (3D Post-Processing)

RenderNode creates custom rendering passes in SceneView's WebGL 2 pipeline.

Basic RenderNode

const LuminanceRenderNode = RenderNode.createSubclass({
  constructor() {
    this.consumes = { required: ["composite-color"] };
    this.produces = "composite-color";
  },

  render(inputs) {
    const input = inputs.find(({ name }) => name === "composite-color");
    const colorTexture = input.getTexture();
    const output = this.acquireOutputFramebuffer();
    const gl = this.gl;

    gl.useProgram(this.program);
    gl.activeTexture(gl.TEXTURE0);
    gl.bindTexture(gl.TEXTURE_2D, colorTexture);
    gl.uniform1i(this.texLocation, 0);

    gl.bindVertexArray(this.vao);
    gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);

    // Preserve depth from input
    output.attachDepth(input.getAttachment(gl.DEPTH_STENCIL_ATTACHMENT));
    return output;
  },

  destroy() {
    if (this.program) this.gl?.deleteProgram(this.program);
    if (this.vao) this.gl?.deleteVertexArray(this.vao);
  },
});

// Add to SceneView
const view = new SceneView({ container: "viewDiv", map });
view.when(() => {
  new LuminanceRenderNode({ view });
});