椭球体表面上的几何外观 An appearance for geometry on the surface of the ellipsoid like
PolygonGeometry
and RectangleGeometry，它支持所有材料，例如 , which supports all materials like MaterialAppearance
with MaterialAppearance.MaterialSupport.ALL。然而，这种外观需要较少的顶点属性，因为片段着色器可以按程序计算 . However, this appearance requires fewer vertex attributes since the fragment shader can procedurally compute normal,
tangent, 和 , and bitangent.
| 名称 Name | 类型 Type | 说明 Description | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
options |
object |
可选 optional
具有以下属性的对象： Object with the following properties:
|
示例： Example:
const primitive = new Cesium.Primitive({
geometryInstances : new Cesium.GeometryInstance({
geometry : new Cesium.PolygonGeometry({
vertexFormat : Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT,
// ...
})
}),
appearance : new Cesium.EllipsoidSurfaceAppearance({
material : Cesium.Material.fromType('Stripe')
})
});另见： See:
成员 Members
static constant Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT : VertexFormat
The
VertexFormat 这一切 that all EllipsoidSurfaceAppearance 实例兼容，只需要 instances are compatible with, which requires only position and st
属性。其他属性在片段着色器中按程序计算。 attributes. Other attributes are procedurally computed in the fragment shader.
When
true，几何体预计位于椭球体表面上 - 而不是在其上方的恒定高度 - 所以 , the geometry is expected to be on the ellipsoid's surface - not at a constant height above it - so EllipsoidSurfaceAppearance#renderState
已启用背面剔除。 has backface culling enabled.
-
默认值： Default Value:
false
When
true，几何形状预计将是封闭的，因此 , the geometry is expected to be closed so
EllipsoidSurfaceAppearance#renderState 已启用背面剔除。如果观察者进入几何图形，它将不可见。 has backface culling enabled. If the viewer enters the geometry, it will not be visible.
-
默认值： Default Value:
false
When
true，片段着色器根据需要翻转表面法线，以确保法线面向观察者，以避免出现黑点。当几何体的两侧都应该有阴影时，这很有用 , the fragment shader flips the surface normal as needed to ensure that the normal faces the viewer to avoid dark spots. This is useful when both sides of a geometry should be shaded like WallGeometry.
-
默认值： Default Value:
true
When
true，片段着色器中使用平面着色，这意味着不考虑光照。 , flat shading is used in the fragment shader, which means lighting is not taking into account.
-
默认值： Default Value:
false
片段着色器的 GLSL 源代码。完整的片段着色器源是在程序上构建的，考虑到 The GLSL source code for the fragment shader. The full fragment shader source is built procedurally taking into account
EllipsoidSurfaceAppearance#material,
EllipsoidSurfaceAppearance#flat, 和 , and EllipsoidSurfaceAppearance#faceForward。使用 . Use EllipsoidSurfaceAppearance#getFragmentShaderSource 获得完整的源码。 to get the full source.
用于确定片段颜色的材质。与其他不同 The material used to determine the fragment color. Unlike other
EllipsoidSurfaceAppearance
属性，这不是只读的，因此外观的材质可以动态更改。 properties, this is not read-only, so an appearance's material can change on the fly.
-
默认值： Default Value:
Material.ColorType另见： See:
渲染几何体时使用的 WebGL 固定功能状态。 The WebGL fixed-function state to use when rendering the geometry.
构建时可以显式定义渲染状态 The render state can be explicitly defined when constructing a EllipsoidSurfaceAppearance
实例，或者通过隐式设置 instance, or it is set implicitly via EllipsoidSurfaceAppearance#translucent
and EllipsoidSurfaceAppearance#aboveGround.
When
true，几何体预计会呈现半透明。 , the geometry is expected to appear translucent.
-
默认值： Default Value:
true
readonly vertexFormat : VertexFormat
The
VertexFormat 该外观实例与之兼容。几何体可以具有更多的顶点属性并且仍然兼容（但会带来潜在的性能成本），但不能有更少的属性。 that this appearance instance is compatible with. A geometry can have more vertex attributes and still be compatible - at a potential performance cost - but it can't have less.
-
默认值： Default Value:
EllipsoidSurfaceAppearance.VERTEX_FORMAT
顶点着色器的 GLSL 源代码。 The GLSL source code for the vertex shader.
方法 Methods
按程序创建完整的 GLSL 片段着色器源。对于 Procedurally creates the full GLSL fragment shader source. For
EllipsoidSurfaceAppearance，这是从 , this is derived from EllipsoidSurfaceAppearance#fragmentShaderSource, EllipsoidSurfaceAppearance#flat, 和 , and EllipsoidSurfaceAppearance#faceForward.
返回： Returns:
完整的 GLSL 片段着色器源代码。 The full GLSL fragment shader source.
创建渲染状态。这不是最终的渲染状态实例；相反，它可以包含与上下文中创建的渲染状态相同的渲染状态属性的子集。 Creates a render state. This is not the final render state instance; instead, it can contain a subset of render state properties identical to the render state created in the context.
返回： Returns:
渲染状态。 The render state.
确定几何体是否是半透明的 Determines if the geometry is translucent based on
EllipsoidSurfaceAppearance#translucent and Material#isTranslucent.
返回： Returns:
true 如果外观是半透明的。 if the appearance is translucent.