Transform

Transform — Aspose.3D FOSS for Java

Example: com.aspose.threed (aspose-3d-foss)

Transform 控制一个的位置信息、方向和缩放 Node 在 3D 场景中。每个节点恰好有一个 Transform,，通过 node.getTransform().

public class Transform extends A3DObject

访问节点的 Transform

import com.aspose.threed.Scene;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("box");
Transform t = node.getTransform();

Example

Example	Example	Example	Example	Example
`translation`	`Vector3`	`getTranslation()`	`setTranslation(Vector3)`	位置相对于父节点原点的偏移。默认 `Vector3(0, 0, 0)`.
`scaling`	`Vector3`	`getScaling()`	`setScaling(Vector3)`	每个轴的非均匀缩放因子。默认 `Vector3(1, 1, 1)`.
`rotation`	`Quaternion`	`getRotation()`	`setRotation(Quaternion)`	旋转以单位四元数表示。设置此项也会更新欧拉角。.
`eulerAngles`	`Vector3`	`getEulerAngles()`	`setEulerAngles(Vector3)`	以度为单位的 (X, Y, Z) 欧拉角旋转。设置此项也会更新四元数旋转。.
`preRotation`	`Vector3`	`getPreRotation()`	`setPreRotation(Vector3)`	欧拉角在主旋转之前应用（用于 FBX 骨架）。.
`postRotation`	`Vector3`	`getPostRotation()`	`setPostRotation(Vector3)`	欧拉角在主旋转之后应用。.
`geometricTranslation`	`Vector3`	`getGeometricTranslation()`	`setGeometricTranslation(Vector3)`	仅本地平移：影响几何体，但不影响子节点。.
`geometricScaling`	`Vector3`	`getGeometricScaling()`	`setGeometricScaling(Vector3)`	仅本地缩放：影响几何体，但不影响子节点。.
`geometricRotation`	`Vector3`	`getGeometricRotation()`	`setGeometricRotation(Vector3)`	仅本地旋转：影响几何体，但不影响子节点。.
`transformMatrix`	`Matrix4`	`getTransformMatrix()`	`setTransformMatrix(Matrix4)`	完整的 4x4 组合变换矩阵。已缓存；在任意组件更改时重新计算。设置该矩阵会分解回平移/缩放/旋转。.

流式设置方法

所有 setter 返回 this,，启用链式调用：:

Example	Example	Example
`setTranslation(double tx, double ty, double tz)`	`double, double, double`	设置位置。.
`setScale(double sx, double sy, double sz)`	`double, double, double`	设置缩放。.
`setEulerAngles(double rx, double ry, double rz)`	`double, double, double`	设置旋转（度）。.
`setRotation(double rx, double ry, double rz, double rw)`	`double, double, double, double`	将旋转设置为四元数 (x, y, z, w)。.
`setPreRotation(double rx, double ry, double rz)`	`double, double, double`	设置预旋转（度）。.
`setPostRotation(double rx, double ry, double rz)`	`double, double, double`	设置后旋转（度）。.
`setGeometricTranslation(double x, double y, double z)`	`double, double, double`	设置几何平移。.
`setGeometricScaling(double sx, double sy, double sz)`	`double, double, double`	设置几何缩放。.
`setGeometricRotation(double rx, double ry, double rz)`	`double, double, double`	设置几何旋转（度）。.

使用示例

设置节点位置

import com.aspose.threed.Scene;
import com.aspose.threed.*;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("box");

// Using fluent setters
node.getTransform().setTranslation(5.0, 0.0, -3.0);

// Or via property setter
node.getTransform().setTranslation(new Vector3(5.0, 0.0, -3.0));

使用欧拉角旋转

import com.aspose.threed.Scene;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("rotated");

// Rotate 45 degrees around Y axis
node.getTransform().setEulerAngles(0.0, 45.0, 0.0);

// Chain multiple operations
node.getTransform()
    .setTranslation(2.0, 0.0, 0.0)
    .setScale(2.0, 2.0, 2.0);

使用四元数旋转

import com.aspose.threed.Scene;
import com.aspose.threed.*;
import com.aspose.threed.*;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("q-rotated");

// 90 degrees rotation around the Y axis
double halfAngle = Math.toRadians(45);   // half the total rotation
Quaternion q = new Quaternion(Math.cos(halfAngle), 0.0, Math.sin(halfAngle), 0.0);
node.getTransform().setRotation(q);

System.out.println("Euler: " + node.getTransform().getEulerAngles());   // synced automatically

同时进行缩放和位置设置

import com.aspose.threed.Scene;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("big-offset");

node.getTransform()
    .setTranslation(10.0, 0.0, 0.0)
    .setScale(3.0, 3.0, 3.0)
    .setEulerAngles(0.0, 90.0, 0.0);

几何偏移（枢轴偏移）

几何变换会相对于节点的枢轴移动几何体，而不影响子节点；这对于将网格居中于其节点非常有用：:

import com.aspose.threed.Scene;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("centered-mesh");

// Shift the mesh half a unit down so its base sits at y=0
node.getTransform().setGeometricTranslation(0.0, -0.5, 0.0);

读取组合变换矩阵

import com.aspose.threed.Scene;
import com.aspose.threed.*;

Scene scene = new Scene();
Node node = scene.getRootNode().createChildNode("m");
node.getTransform().setTranslation(1.0, 2.0, 3.0);
node.getTransform().setEulerAngles(0.0, 45.0, 0.0);

Matrix4 m = node.getTransform().getTransformMatrix();
System.out.println(m.getClass().getName());   // com.aspose.threed.Matrix4