VR+全景播放器+頭控講解-01-知識儲備
VR+全景播放器+頭控講解-02-創建球體
VR+全景播放器+頭控講解-03-渲染視頻
VR+全景播放器+頭控講解-04-滑動手勢
VR+全景播放器+頭控講解-05-伸縮畫面
VR+全景播放器+頭控講解-06-頭控實現
VR+全景播放器+頭控講解-07-分屏技術

學習目標

掌握頭控部分布局
如何檢測頭控按鈕被選中
如何實現懸停動畫

在UIView上面布局我們可以使用UIButton UIView UIImageView等，但是是在3D場景中,我們不能使用UIView,我們要使用平面幾何當視圖使用,下面具體介紹一下

分析

243FA4BB-FAC5-4A93-A9DF-C3A1F447F010.png

提示幾點

頭控根節點可以放在根節點上中心或者球體中心都是可以的,但是考慮到后期我們要進行視頻濾波,所以最好放到場景節點上

低頭菜單出現,抬頭菜單消失,這個要根據重力感應在X軸旋轉決定的

當抬頭時菜單總是出現在下方,一旦出現不會跟隨照相機轉動,當重力感應變化時,我們讓頭控節點的繞著y軸旋轉

實現步驟

第一步.創建菜單節點

+(SCNNode*)createBackgroundNode{/// 創建一個背景色SCNNode* bgNode = [SCNNode node];bgNode.position = SCNVector3Make(0, CONTROL_DISTANCE/2, -CONTROL_DISTANCE);bgNode.geometry.firstMaterial.cullMode = SCNCullModeBack;bgNode.rotation = SCNVector4Make(1, 0, 0, atan(1/2.0));return bgNode;} +(SCNNode*)createShadowNode{SCNNode *shadowNode = [SCNNode node];shadowNode.geometry= [SCNPlane planeWithWidth:MENU_MAX_LENGTH height:BUTTON_WIDHT+BUTTON_WIDHT/2.0];shadowNode.geometry.firstMaterial.diffuse.contents = BACKGROUND_MENU_SHOW_NAME;shadowNode.position = SCNVector3Make(0, 0, 0);shadowNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return shadowNode; }+(SCNNode*)createPlayNode{SCNNode* playNode = [SCNNode node];playNode.geometry = [SCNPlane planeWithWidth:BUTTON_WIDHT*0.8 height:BUTTON_WIDHT*0.8];playNode.geometry.firstMaterial.diffuse.contents = ICON_PLAY_NAME;playNode.position = SCNVector3Make(-20, 0, 2);playNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return playNode; } +(SCNNode*)createPreviousNode{/// 第六步-創建播放上一個視頻的節點SCNNode* previousNode = [SCNNode node];previousNode.geometry = [SCNPlane planeWithWidth:BUTTON_WIDHT*0.8 height:BUTTON_WIDHT*0.8];previousNode.geometry.firstMaterial.diffuse.contents = ICON_PREVIOUS_NAME;previousNode.position = SCNVector3Make(-60, 0, 2);previousNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return previousNode; } +(SCNNode*)createAfterNode{SCNNode *nextNode = [SCNNode node];nextNode.geometry = [SCNPlane planeWithWidth:BUTTON_WIDHT*0.8 height:BUTTON_WIDHT*0.8];nextNode.geometry.firstMaterial.diffuse.contents = ICON_AFTER_NAME;nextNode.position = SCNVector3Make(20, 0, 2);nextNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return nextNode; } +(SCNNode*)createMoreNode{SCNNode* moreNode = [SCNNode node];moreNode.geometry = [SCNPlane planeWithWidth:BUTTON_WIDHT*0.8 height:BUTTON_WIDHT*0.8];moreNode.geometry.firstMaterial.diffuse.contents = ICON_MENU_HIDDEN_NAME;moreNode.position = SCNVector3Make(60, 0, 2);moreNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return moreNode; } +(SCNNode*)createHighVoiceNode{SCNNode* voiceHighNode = [SCNNode node];voiceHighNode.geometry = [SCNPlane planeWithWidth:BUTTON_WIDHT*0.8 height:BUTTON_WIDHT*0.8];voiceHighNode.geometry.firstMaterial.diffuse.contents = ICON_VOICE_HIGH_NAME;voiceHighNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return voiceHighNode; } +(SCNNode*)createLowVoiceNode{SCNNode* voiceLowNode = [SCNNode node];voiceLowNode.geometry = [SCNPlane planeWithWidth:BUTTON_WIDHT*0.8 height:BUTTON_WIDHT*0.8];voiceLowNode.geometry.firstMaterial.diffuse.contents = ICON_VOICE_LOW_NAME;voiceLowNode.geometry.firstMaterial.cullMode = SCNCullModeBack;return voiceLowNode; }

創建的方法基本一致,調節一下位置即可!

第二步 添加到先把功能按鈕節點添加到頭控背景節點上,然后將背景節點添加到頭控根節點上去

[self.scene.rootNode addChildNode:self.controlNode]; [self.controlNode addChildNode:self.bgNode]; [self.bgNode addChildNode:self.shadowNode]; [self.bgNode addChildNode:self.playOrPauseNode]; [self.bgNode addChildNode:self.proviousNode]; [self.bgNode addChildNode:self.AfterNode]; [self.bgNode addChildNode:self.showMoreNode]; [self.bgNode addChildNode:self.lowVoiceNode]; [self.bgNode addChildNode:self.highVoiceNode]; [self.scene.rootNode addChildNode:self.eyeNode];

第三步 添加點控節點,將其放在添加到照相機節點上去,這樣照相機轉動的時候,它就能跟著轉動,效果就是一直在屏幕中央

[self.eyeNode addChildNode:self.dotNode];

第四步 抬頭小時低頭出現

-(void)controlEyeNodeInVR:(SCNVector3)vector{ // 向上抬頭 并且local if ( vector.x>0.8 &&self.bgNode.hidden==false){self.bgNode.hidden = true;self.dotNode.hidden = true; }else if ( vector.x<0.8 &&self.bgNode.hidden){self.bgNode.hidden = false;self.dotNode.hidden = false;SCNVector3 eulerAngles = self.controlNode.eulerAngles;// eulerAngles.y = -vector.z;eulerAngles.z = vector.z;self.controlNode.eulerAngles = eulerAngles;} }

第五步 如何檢測點控射線和頭控按鈕相交
思路:

先將按鈕轉換到照相機節點上,點控射線是否和按鈕區域相交,就是相當于頭控坐標 x在范圍 [-button.width/2,button.width/2]內, y在 [-button.height/2.button.heigth/2.0]內

/// 下面就舉一個例子,其它的都是類似的 SCNVector3 proviousPosition = [self.bgNode convertPosition:self.proviousNode.position toNode:self.self.eyeNode]; if (proviousPosition.x > -BUTTON_WIDHT/2 && proviousPosition.x < BUTTON_WIDHT/2 && proviousPosition.y > -BUTTON_WIDHT/2 && proviousPosition.y < BUTTON_WIDHT/2 ){if (!self.controlDotIn.inPreviousNode&&!self.proviousNode.hidden){// 第一次進入 還沒有離開// 開始執行懸停動畫[self startAnimation];}_controlDotIn.inPreviousNode = YES;return; }else if(_controlDotIn.inPreviousNode){// 檢測到離開按鈕return; }

懸停動畫的實現

第一步 創建動畫行為

-(void)createAnimation{ /// 創建動畫節點 self.animationNode = [SCNNode node]; self.animationNode.geometry = [SCNPlane planeWithWidth:CONTROL_DISTANCE/5.0 height:CONTROL_DISTANCE/5.0]; self.animationNode.hidden = true;// 控制點上增加動畫節點 [self.dotNode addChildNode:self.animationNode]; __weak XJRenderView* weakSelf = self; self.animationAction = [SCNAction customActionWithDuration:3 actionBlock:^(SCNNode * _Nonnull node, CGFloat elapsedTime) {int time = (int) (elapsedTime *(weakSelf.gif.count-1)/3.0);node.geometry.firstMaterial.diffuse.contents = weakSelf.gif[time];if(time == weakSelf.gif.count-1){[weakSelf animationDidStop];} }]; } -(NSArray *)gif{if(!_gif){NSMutableArray *gif= [NSMutableArray arrayWithCapacity:GIF_LENGTH];for(int i = 0 ; i< GIF_LENGTH ;i++){NSString *name = [NSString stringWithFormat:GIF_PREFIX_NAME_FORMAT,i];[gif addObject:name];}_gif = gif;}return _gif; }

第二步 在執行的節點上執行動畫行為

-(void)startAnimation{[self.animationNode runAction:self.animationAction]; }

本節講解完畢
SceneKit 中文教程

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