float czm_private_getLambertDiffuseOfMaterial(vec3 lightDirectionEC, czm_material material)
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{
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return czm_getLambertDiffuse(lightDirectionEC, material.normal);
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}
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float czm_private_getSpecularOfMaterial(vec3 lightDirectionEC, vec3 toEyeEC, czm_material material)
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{
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return czm_getSpecular(lightDirectionEC, toEyeEC, material.normal, material.shininess);
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}
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/**
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* Computes a color using the Phong lighting model.
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*
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* @name czm_phong
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* @glslFunction
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*
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* @param {vec3} toEye A normalized vector from the fragment to the eye in eye coordinates.
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* @param {czm_material} material The fragment's material.
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*
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* @returns {vec4} The computed color.
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*
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* @example
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* vec3 positionToEyeEC = // ...
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* czm_material material = // ...
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* vec3 lightDirectionEC = // ...
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* gl_FragColor = czm_phong(normalize(positionToEyeEC), material, lightDirectionEC);
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*
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* @see czm_getMaterial
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*/
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vec4 czm_phong(vec3 toEye, czm_material material, vec3 lightDirectionEC)
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{
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// Diffuse from directional light sources at eye (for top-down)
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float diffuse = czm_private_getLambertDiffuseOfMaterial(vec3(0.0, 0.0, 1.0), material);
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if (czm_sceneMode == czm_sceneMode3D) {
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// (and horizon views in 3D)
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diffuse += czm_private_getLambertDiffuseOfMaterial(vec3(0.0, 1.0, 0.0), material);
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}
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float specular = czm_private_getSpecularOfMaterial(lightDirectionEC, toEye, material);
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// Temporary workaround for adding ambient.
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vec3 materialDiffuse = material.diffuse * 0.5;
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vec3 ambient = materialDiffuse;
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vec3 color = ambient + material.emission;
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color += materialDiffuse * diffuse * czm_lightColor;
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color += material.specular * specular * czm_lightColor;
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return vec4(color, material.alpha);
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}
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vec4 czm_private_phong(vec3 toEye, czm_material material, vec3 lightDirectionEC)
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{
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float diffuse = czm_private_getLambertDiffuseOfMaterial(lightDirectionEC, material);
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float specular = czm_private_getSpecularOfMaterial(lightDirectionEC, toEye, material);
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vec3 ambient = vec3(0.0);
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vec3 color = ambient + material.emission;
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color += material.diffuse * diffuse * czm_lightColor;
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color += material.specular * specular * czm_lightColor;
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return vec4(color, material.alpha);
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}
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