playcanvas
Version:
Open-source WebGL/WebGPU 3D engine for the web
67 lines (66 loc) • 2.61 kB
JavaScript
import { Quat } from "../../core/math/quat.js";
import { Vec3 } from "../../core/math/vec3.js";
import { Mat4 } from "../../core/math/mat4.js";
import { ASPECT_MANUAL, LIGHTTYPE_DIRECTIONAL, LIGHTTYPE_OMNI, LIGHTTYPE_SPOT, PROJECTION_ORTHOGRAPHIC, PROJECTION_PERSPECTIVE } from "../constants.js";
import { Camera } from "../camera.js";
import { GraphNode } from "../graph-node.js";
const _viewMat = new Mat4();
const _viewProjMat = new Mat4();
const _viewportMatrix = new Mat4();
class LightCamera {
// camera rotation angles used when rendering cubemap faces
static pointLightRotations = [
new Quat().setFromEulerAngles(0, 90, 180),
new Quat().setFromEulerAngles(0, -90, 180),
new Quat().setFromEulerAngles(90, 0, 0),
new Quat().setFromEulerAngles(-90, 0, 0),
new Quat().setFromEulerAngles(0, 180, 180),
new Quat().setFromEulerAngles(0, 0, 180)
];
static create(device, name, lightType, face) {
const camera = new Camera(device);
camera.node = new GraphNode(name);
camera.aspectRatio = 1;
camera.aspectRatioMode = ASPECT_MANUAL;
camera._scissorRectClear = true;
switch (lightType) {
case LIGHTTYPE_OMNI:
camera.node.setRotation(LightCamera.pointLightRotations[face]);
camera.fov = 90;
camera.projection = PROJECTION_PERSPECTIVE;
break;
case LIGHTTYPE_SPOT:
camera.projection = PROJECTION_PERSPECTIVE;
break;
case LIGHTTYPE_DIRECTIONAL:
camera.projection = PROJECTION_ORTHOGRAPHIC;
break;
}
return camera;
}
static _spotCookieCamera = null;
// temporary camera to calculate spot light cookie view-projection matrix when shadow matrix is not available
// todo - unify the code with the shadow spot camera
static evalSpotCookieMatrix(light) {
let cookieCamera = LightCamera._spotCookieCamera;
if (!cookieCamera) {
cookieCamera = LightCamera.create(light.device, "SpotCookieCamera", LIGHTTYPE_SPOT);
LightCamera._spotCookieCamera = cookieCamera;
}
cookieCamera.fov = light._outerConeAngle * 2;
const cookieNode = cookieCamera._node;
cookieNode.setPosition(light._node.getPosition());
cookieNode.setRotation(light._node.getRotation());
cookieNode.rotateLocal(-90, 0, 0);
_viewMat.setTRS(cookieNode.getPosition(), cookieNode.getRotation(), Vec3.ONE).invert();
_viewProjMat.mul2(cookieCamera.projectionMatrix, _viewMat);
const cookieMatrix = light.cookieMatrix;
const rectViewport = light.atlasViewport;
_viewportMatrix.setViewport(rectViewport.x, rectViewport.y, rectViewport.z, rectViewport.w);
cookieMatrix.mul2(_viewportMatrix, _viewProjMat);
return cookieMatrix;
}
}
export {
LightCamera
};