Group that allows to change its perspective along X axis (will be very simple to change axis) using orthographic camera and Scene2d. You have to set camera.near = -1000 and camera.far = 1000 on your OrthographicCamera.

PerspectiveGroup.java

package om.mandir.gdx.utils.actors;

import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.math.Affine2;
import com.badlogic.gdx.math.Matrix4;
import com.badlogic.gdx.scenes.scene2d.Group;

/**
 * Allows to render Group in perspective.
 * 
 * Requires those OrthographicCamera settings:
 * camera.near = -1000;
 * camera.far = 1000;
 * @author Lukasz Zmudziak, @lukz_dev on 2016-06-06.
 */
public class PerspectiveGroup extends Group {

    private Matrix4 transformMatrix = new Matrix4();
    private Matrix4 projectionMatrix = new Matrix4();

    private Affine2 worldTransform = new Affine2();

    private float xAxisRotation = 0;
    private float perspective = 1f / 1500f;

    @Override
    public void draw(Batch batch, float parentAlpha) {
        transformMatrix.set(batch.getTransformMatrix());
        projectionMatrix.set(batch.getProjectionMatrix());
        batch.end();

        float originX = this.getOriginX();
        float originY = this.getOriginY();
        float rotation = this.getRotation();
        float scaleX = this.getScaleX();
        float scaleY = this.getScaleY();

        float scaledOriginX = originX * scaleX;
        float scaledOriginY = originY * scaleY;

        worldTransform.setToTrnRotScl(scaledOriginX, scaledOriginY, rotation, scaleX, scaleY);
        if (originX != 0 || originY != 0) worldTransform.translate(-originX, -originY);

        batch.getTransformMatrix().set(worldTransform);

        batch.getProjectionMatrix().translate(getX() + (originX - scaledOriginX), getY() + (originY - scaledOriginY), 0);
        batch.getProjectionMatrix().val[Matrix4.M32] = perspective;
        batch.getProjectionMatrix().rotate(1, 0, 0, xAxisRotation);

        batch.begin();

        drawChildren(batch, parentAlpha);

        //reset
        batch.setTransformMatrix(transformMatrix);
        batch.setProjectionMatrix(projectionMatrix);
    }

    public float getPerspective() {
        return perspective;
    }

    public void setPerspective(float perspective) {
        this.perspective = perspective;
    }

    public float getXAxisRotation() {
        return this.xAxisRotation;
    }

    public void setXAxisRotation(float val) {
        this.xAxisRotation = val;
    }
}