osgEarth Topographic shading map drawing

        Different elevations are colored with different colors , It can realize the drawing of elevation shading map ;OsgEarth Provides an interface for dizzy terrain , namely ContourMap（ContourMapLayer）, namely .earth Add... To the file ContourMap Layer can realize the function of terrain dizziness map （ among .earth The analysis of the document to the creation of the earth can be referred to Write an article -CSDN Blog ）.

        This article will elaborate on ,ContourMap How to realize the drawing of terrain shading map , And answer the following questions ：

1. ContourMap Setting of external interface
2. ContourMap Layers shader Set up
3. osgEarth::Layer How to influence osgEarth::MapNode Render states

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Catalog

• 1 ContourMapLayer class Brief introduction
• 2 ContourMap.glsl The understanding of the
• 3 ContourMapLayer And MapNode Interaction of

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Content

• 1 Preface

      ContourMapLayer The inheritance structure of the class is shown in the following figure ：