noise.earth

<!-- 
osgEarth Sample
-->

<map version="2">

    <options>
        <terrain normal_maps="true"/>
    </options>

    <elevation name="readymap_elevation" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/116/</url>
    </elevation>
    
    <extensions>
        <noise size="1024" num_channels="1"/>
        
        <contour_map/>
        
        <sky hours="20.0"/>
        
        <terrainshader>
          <code><![CDATA[
          
            #version 330
            
            #pragma vp_entryPoint "makeSomeNoise"
            #pragma vp_location   "fragment_coloring"
            
            // Try modifying these for fun.
            uniform float baseLOD = 1;
             
            uniform sampler2D oe_noise_tex;
            
            uniform vec4 oe_tile_key;
            in vec4 oe_layer_tilec;
            
            vec2 getNoiseCoords(in float lod)
            {
                float dL        = oe_tile_key.z - lod;
                float factor    = exp2(dL);
                float invFactor = 1.0/factor;
                vec2  result    = oe_layer_tilec.st * vec2(invFactor);

                // For upsampling we need to calculate an offset as well
                if ( factor >= 1.0 )
                {
                    vec2 a = floor(oe_tile_key.xy * invFactor);
                    vec2 b = a * factor;
                    vec2 c = (a+1.0) * factor;
                    vec2 offset = (oe_tile_key.xy-b)/(c-b);
                    result += offset;
                }
                return result;
            }

            void makeSomeNoise(inout vec4 color)
            {
                vec2 coords = getNoiseCoords( floor(baseLOD) );
                float n = 1.5 * texture( oe_noise_tex, coords ).r;
                color.rgb *= n;
            }
            
          ]]></code>
        </terrainshader>
        
        <viewpoints>
            <viewpoint name="Wash St. 430K" heading="-1.002577141807595" height="3694.875054217875" lat="46.85393268075167" long="-121.7764141794478" pitch="-89.85464953482169" range="426454.3850159062"/>
            <viewpoint name="Mt R. Nadir 30K" heading="0.5013023037097585" height="4101.627114404924" lat="46.85909894548915" long="-121.7598368518208" pitch="-89.43249895879129" range="29029.34246828893"/>
            <viewpoint name="Mt R. Oblique 30K" heading="17.33521725357022" height="2462.60273069609" lat="46.82181702111031" long="-121.7814936386096" pitch="-21.29241356548601" range="23926.75258864516"/>
            <viewpoint name="Mt R. Closeup" heading="-109.6842970297122" height="3843.486737414263" lat="46.85528453766688" long="-121.7455004166102" pitch="-4.617466338845979" range="951.4780720092711"/>
            <viewpoint name="Mt R. Trees" heading="-98.36122712710565" height="1639.304918398149" lat="46.78673277044066" long="-121.743286318636" pitch="-10.85365380742088" range="257.5853045645545"/>
            <viewpoint name="Nepal" heading="-72.70835146844568" height="6334.845537136309" lat="27.94213038800919" long="86.9936567556778" pitch="-18.63803872963365" range="13611.24948464565"/>
            <viewpoint name="Nepal NF" heading="-49.14546953546358" height="6334.332569343038" lat="27.9421778947837" long="86.9935949004298" pitch="-3.643325527310435" range="13302.81192964212"/>
            <viewpoint name="Matterhorn" heading="-1.429462844200832" height="2282.858508689329" lat="45.95106319557" long="7.642741711675961" pitch="-25.12269405854052" range="26690.10606054494"/>
        </viewpoints>
    </extensions>
</map>