如何对节点进行颜色淡入淡出/过渡

Question

我希望定期更改我的SCNBox的颜色，例如，游戏展开的节点平滑地过渡颜色。

        let base = SCNBox(width: 1, height: 1, length: 1, chamferRadius: 0)
        let emptyBase = SCNNode(geometry: base)
        emptyBase.position = SCNVector3(0, 0.5, 0)
        emptyBase.physicsBody = SCNPhysicsBody.kinematic()
        //emptyBase.physicsBody!.restitution = 1
        emptyBase.physicsBody!.categoryBitMask = CC.base.rawValue

        if #available(iOS 9.0, *) {
            emptyBase.physicsBody!.contactTestBitMask = CC.ball.rawValue
        } else {
            // Fallback on earlier versions
            emptyBase.physicsBody!.collisionBitMask = CC.ball.rawValue
        }

            if GameViewController.gameOverlay!.scoreNumber >= 0 {
                let defaultMaterial = SCNMaterial()
                    defaultMaterial.diffuse.contents = randomColor()
                    defaultMaterial.specular.contents = randomColor()
                    defaultMaterial.emission.contents = randomColor()
                base.firstMaterial? = defaultMaterial

            }
        rootNode.addChildNode(emptyBase)
    }

提前感谢！

Answer 1

你可以用隐式动画做这样的事情：

   // Objective-C
        [SCNTransaction setAnimationDuration:2.0];
        base.firstMaterial = defaultMaterial;