h3d.scene.MeshBatch instances missing shadows

Why does only one instance of a mesh batch render shadows?

heaps-meshbatch-shadows

Ubuntu 20.04 / Haxe 4.1.1 / Heaps 1.8.0 / Hashlink 1.11 hlsdl

Sample code is below. If I change it to use either separate mesh objects or single-instance mesh batches, then all shadows appear as expected.

Looking at #801 I tried adjusting DirShadowMap.calcShadowBounds and the light camera camera.orthoBounds and managed to get some additional shadows appearing, but never everything on every visible instance. Also, my naive expansion of the camera.orthoBounds volume messed up shadow intensity and radius so I'm guessing that's the wrong approach for a zooming out on large scene?

The instances are being emitted in update() rather than init() because the game that shows this problem is using procedural generation, so most of the scene/world doesn't exist unless it's being viewed by the camera.

class Main extends hxd.App {

  private var batchCube:h3d.scene.MeshBatch;
  private var batchPlatform:h3d.scene.MeshBatch;

  public static function main() {
    return new Main();
  }

  public function new() {
    super();
  }

  override function init() {
    super.init();

    hxd.Window.getInstance().resize(1000,600);

    var cube = new h3d.prim.Cube(1,1,1,true);
    cube.unindex();
    cube.addNormals();
    cube.addUVs();

    var platform = new h3d.prim.Cube(10,10,1,true);
    platform.unindex();
    platform.addNormals();
    platform.addUVs();

    batchCube = new h3d.scene.MeshBatch(cube, s3d);
    batchPlatform = new h3d.scene.MeshBatch(platform, s3d);

    var dirlight = new h3d.scene.fwd.DirLight(new h3d.Vector(0.5,0,-1), s3d);
    dirlight.color.load(new h3d.Vector(0.5,0.5,0.5));

    s3d.lightSystem.ambientLight.set(0.75,0.75,0.75);

    var shadow = s3d.renderer.getPass(h3d.pass.DefaultShadowMap);
    shadow.power /= 15;

    s3d.camera.zNear = 1;
    s3d.camera.zFar = 1000;
    s3d.camera.pos.set(0, 15, 30);
    s3d.camera.target.set(0, 0, 0);

    new h3d.scene.CameraController(s3d).loadFromCamera();
  }

  override function update(dt:Float) {
    batchCube.begin(2);

    batchCube.x = -6;
    batchCube.y = 0;
    batchCube.z = 0.5;
    batchCube.material.color.load(new h3d.Vector(0.75,0,0));
    batchCube.material.mainPass.enableLights = true;
    batchCube.material.shadows = true;
    batchCube.material.castShadows = true;
    batchCube.material.receiveShadows = true;
    batchCube.emitInstance();

    batchCube.x = 6;
    batchCube.y = 0;
    batchCube.z = 0.5;
    batchCube.material.color.load(new h3d.Vector(0.75,0,0));
    batchCube.material.mainPass.enableLights = true;
    batchCube.material.shadows = true;
    batchCube.material.castShadows = true;
    batchCube.material.receiveShadows = true;
    batchCube.emitInstance();

    batchPlatform.begin(2);

    batchPlatform.x = -6;
    batchPlatform.y = 0;
    batchPlatform.z = -0.5;
    batchPlatform.material.color.load(new h3d.Vector(0.5,0.5,0.5));
    batchPlatform.material.mainPass.enableLights = true;
    batchPlatform.material.shadows = true;
    batchPlatform.material.castShadows = true;
    batchPlatform.material.receiveShadows = true;
    batchPlatform.emitInstance();

    batchPlatform.x = 6;
    batchPlatform.y = 0;
    batchPlatform.z = -0.5;
    batchPlatform.material.color.load(new h3d.Vector(0.5,0.5,0.5));
    batchPlatform.material.mainPass.enableLights = true;
    batchPlatform.material.shadows = true;
    batchPlatform.material.castShadows = true;
    batchPlatform.material.receiveShadows = true;
    batchPlatform.emitInstance();
  }
}

HeapsIO / heaps

h3d.scene.MeshBatch instances missing shadows #841