Index photon(s) described, 8 distributing over surfaces, 40 limited amount of energy, 37 low settings for the number of, 40f restricting emission area for, 38­39 settings, reducing, 43­44, 44f systematically increasing, 39­43 Photon Emissions, for caustics, 163­164, 164f photon rendering, 8 photon target area covered by, 38f disabling, 166, 167f photon tracing, 12­13, 14f Photons per Sample, increasing, 39­40 photorealistic images, 2 physical environment, in an outdoor scene, 64­65 Physical Scale adjusting to match light intensity, 202f in Exposure Control, 52, 118, 201­202 setting, 55­56, 56f Project FG Points drop-down list, 239, 239f Project Points from Positions Along Camera Path, 239 ProMaterials: Glazing, 221, 221f ProMaterials: Hardwood material, 224 ProMaterials material type adjusting parameters hidden from the user, 221f advantages and disadvantages, 224 Autodesk standardizing on, 219 described, 77, 90, 91f design of, 78 exploring, 220­222 imported, 222­224 inflexibility of, 224­225 libraries of materials including, 220 listing of available, 220, 221f proxies assigning material to, 210, 211f creating multiple at once, 212 displaying as bounding boxes, 210, 212f as more efficient than Instance clones, 208 proxy objects, 208. See also mr Proxy objects