切换不同模块时，显示天地图影像

guoshilong

2023-02-03 dd4c39fb89fb2a2d0795036e61c104eb2d08afee

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/**
 * DOC_TBA
 *
 * @name czm_ray
 * @glslStruct
 */
struct czm_ray
{
    vec3 origin;
    vec3 direction;
};