Transform and SceneGraph

Getting Components

Rhodonite is a component-oriented library. Operations on Entity (an object in 3D space) are actually performed on the various components of Entity.

Therefore, we need to get the components from Entity first.

const cubeEntity = Rn.MeshHelper.createCube();
const cubeTransformComponent = cubeEntity.getTransform();

Transform component

The transform component allows you to manipulate translation, scale, and rotation in local coordinates for that Entity.

const cubeTransformComponent = cubeEntity.getTransform();
cubeTransformComponent.localPosition = Rn.Vector3.fromCopy3(0, 3, 0);
cubeTransformComponent.localEulerAngles = Rn.Vector3.fromCopy3(90, 0, 0);
cubeTransformComponent.localScale = Rn.Vector3.fromCopy3(2, 2, 2);

SceneGraph component

The SceneGraph component allows you to build parent-child relationships between Entities.

const groupEntity = Rn.EntityHelper.createGroupEntity();
const cubeEntity = Rn.MeshHelper.createCube();
const groupSceneGraphComponent = groupEntity.getSceneGraph();
groupSceneGraphComponent.addChild(cubeEntity.getSceneGraph());

It can also manipulate translations and rotations in world space.

const groupEntity = Rn.EntityHelper.createGroupEntity();
groupEntity.position = Rn.Vector3.fromCopy3(0, 3, 0);
groupEntity.eulerAngles = Rn.Vector3.fromCopy3(90, 0, 0);

Shortcut methods for Transform and SceneGraph components

Thus, essentially, for any operation on Entity, you must first obtain the component of the corresponding function. However, for the Transform and SceneGraph components, there are also key methods in Entity itself as shortcuts, since they are often used.

const cubeEntity = Rn.MeshHelper.createCube();
cubeEntity.localPosition = Rn.Vector3.fromCopy3(0, 3, 0);
cubeEntity.localEulerAngles = Rn.Vector3.fromCopy3(90, 0, 0);
cubeEntity.localScale = Rn.Vector3.fromCopy3(2, 2, 2);
cubeEntity.position = Rn.Vector3.fromCopy3(0, 3, 0);
cubeEntity.eulerAngles = Rn.Vector3.fromCopy3(90, 0, 0);

const groupEntity = Rn.EntityHelper.createGroupEntity();
groupEntity.addChild(cubeEntity.getSceneGraph());

You can learn about each of the shortcut methods provided in the following file

https://github.com/actnwit/RhodoniteTS/blob/master/src/foundation/components/Transform/ITransformEntity.ts https://github.com/actnwit/RhodoniteTS/blob/master/src/foundation/components/SceneGraph/ISceneGraphEntity.ts