feat: add map.options.cameraNearScale to adjust map.cameraNear

Author: fuzhenn

packages/maptalks/src/map/Map.Camera.ts

@@ -723,7 +723,7 @@ Map.include(/** @lends Map.prototype */{
             const fov = this.getFov() * Math.PI / 180;
             const farZ = this._getCameraFar(fov, this.getPitch());
             this.cameraFar = farZ;
-            this.cameraNear = this.cameraCenterDistance / 20;
+            this.cameraNear = this.cameraCenterDistance / 20 * this.options['cameraNearScale'];
             // camera projection matrix
             const projMatrix = this.projMatrix || createMat4();
             const isWebGPU = this.options.renderer === 'gpu';

packages/maptalks/src/map/Map.ts

@@ -170,6 +170,7 @@ const options: MapOptionsType = {
     'maxFPS': 0,
     'debug': false,
     'cameraFarUndergroundInMeter': 2000,
+    'cameraNearScale': 1,
 
     'onlyWebGL1': false,
     'forceRedrawPerFrame': false,
@@ -2944,6 +2945,7 @@ export type MapOptionsType = {
     forceRedrawPerFrame?: boolean;
     extensions?: string[];
     optionalExtensions?: string[];
+    cameraNearScale?: number;
 }
 
 export type MapCreateOptionsType = {