words written in front
The effect achieved in this article is to display the 3dTileset model, and change the color when clicking on a single model, which is the so-called model singulation. This function is of great significance and is the basis of many needs.
Effect
Model Unitization Demonstration
Implementation ideas
- Click the left mouse button to get the position
- Obtain the model object or 3DTile object under the position according to the mouse position through the corresponding Api
- Modify the corresponding model or a single 3dTile attribute value
problems encountered
The 3DTile object obtained through Cesium's Api viewer.scene.drillPick may not be a whole. For example, a building may be divided into many parts. This requires communication with colleagues who make model data to make the required model. A whole, and mark the specific model with the corresponding id number to facilitate the display and processing of subsequent front-end data.
specific code
viewer.screenSpaceEventHandler.setInputAction(function onLeftClick(movement) {
const {
position} = movement//屏幕坐标
let picks = viewer.scene.drillPick(movement.position, 1);
let type = "";
for (let i = 0; i < picks.length; i++) {
if (picks[i] instanceof Cesium.Cesium3DTileFeature) {
type = "3dtiles";
} else if (picks[i] && picks[i].primitive && picks[i].node && picks[i].mesh) {
type = 'model';
}
}
console.log(type, "type")
if (type === "3dtiles") {
let pick = picks[0];
if (pick instanceof Cesium.Cesium3DTileFeature) {
//修改颜色
pick.color = Cesium.Color.fromAlpha(Cesium.Color.BLUE, 1);
}
} else if (type === 'model') {
modelBack(movement)
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK)
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