{"id":"orbit-study","units":"normalized-arbitrary","interpretation":"Editorial combinations of camera trajectory parameters, not mutually exclusive standardized shot types or capture metadata.","cameraAim":"Eight path variants look at their center at height 1.2; the comparisons use their own explicit position and gaze rules.","directionConvention":"clockwise viewed from above","directions":["clockwise","counterclockwise"],"variants":[{"id":"arc","title":"局部弧线","english":"Partial arc","sweep":90,"radius":[4,4],"height":[1.6,1.6],"targetTravel":0,"paired":false,"note":"只走一段弧线，改变观察侧面。90°是本例设定，弧线镜头没有固定角度。"},{"id":"half","title":"半环绕","english":"180° orbit","sweep":180,"radius":[4,4],"height":[1.6,1.6],"targetTravel":0,"paired":false,"note":"从主体一侧绕到另一侧；需要规划视线、背景和轴线关系。"},{"id":"full","title":"整圈环绕","english":"360° orbit","sweep":360,"radius":[4,4],"height":[1.6,1.6],"targetTravel":0,"paired":false,"note":"本例完整走一圈并回到起始机位；环绕镜头本身不要求完成360°。"},{"id":"spiral-in","title":"螺旋靠近","english":"Spiral in","sweep":180,"radius":[4,2],"height":[1.6,1.6],"targetTravel":0,"paired":false,"note":"绕行的同时缩小半径；改变的是机位距离，不是镜头变焦。"},{"id":"spiral-out","title":"螺旋远离","english":"Spiral out","sweep":180,"radius":[2,4],"height":[1.6,1.6],"targetTravel":0,"paired":false,"note":"绕行的同时扩大半径，可逐渐带出环境；焦距在本示意中不参与变化。"},{"id":"rising","title":"上升环绕","english":"Rising orbit","sweep":180,"radius":[4,4],"height":[1.6,3.6],"targetTravel":0,"paired":false,"note":"水平绕行与机位升高同时发生；不是仅在原地向上摇。下降可用相反的高度变化规划。"},{"id":"moving","title":"跟随式环绕","english":"Moving-target orbit","sweep":180,"radius":[4,4],"height":[1.6,1.6],"targetTravel":2.5,"paired":false,"note":"主体和环绕中心一起移动；相对主体的圆弧不等于世界坐标中的固定圆。"},{"id":"paired","title":"双人环绕","english":"Two-subject orbit","sweep":180,"radius":[4,4],"height":[1.6,1.6],"targetTravel":0,"paired":true,"note":"围绕两人之间的中心绕行，朝向组中心不保证两人始终无遮挡或同时入画。"}],"comparisons":[{"id":"pan-orbit","title":"横摇与环绕","left":"原地横摇","right":"围绕主体","note":"两边使用相同的转向角度。横摇保持机位，主体会离开画面；环绕改变机位并持续朝向主体。"},{"id":"orbit-spiral","title":"等距与靠近","left":"等距环绕","right":"螺旋靠近","note":"绕行角度相同、视场角固定。右侧缩小机位半径，观察主体大小、侧面与前后景关系。"},{"id":"fixed-follow","title":"固定与跟随中心","left":"围绕固定位置","right":"随主体移动","note":"两边的主体以相同方式平移，机头都朝向主体。左侧围绕原位置，右侧的环绕中心随主体移动。"},{"id":"full-orbit","title":"半圈与整圈","left":"半环绕 · 180°","right":"整圈环绕 · 360°","note":"半圈与整圈使用相同起点和半径。观察正面、侧面与背面，以及整圈结束时回到起始构图。"},{"id":"vertical-orbit","title":"上升与下降","left":"上升环绕","right":"下降环绕","note":"从相同机位出发，绕行角度和水平半径一致；一侧升高，另一侧降低，并持续朝向主体。"},{"id":"paired-orbit","title":"单人与双人","left":"单主体环绕","right":"双主体环绕","note":"两边机位路径相同。右侧A、B模型相向放置，观察绕到侧面时的遮挡，再继续绕到另一侧。"}],"previewOptics":{"verticalFovDegrees":55,"near":0.08,"far":60}}