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In spite of widely differing approaches the current state of the art algorithms are surprisingly similar with respect to the richness of the scenes they can process. One attribute these algorithms have in common is the use of a conventional passive data base to represent the objects being modeled. This paper postulates and explores the use of an alternative modeling technique which uses procedures to represent the objects being modeled. The properties and structure of such "procedure models" are investigated and an algorithm based on them is presented.">Many algorithms have been developed for synthesizing shaded images of three dimensional objects modeled by computer. In spite of widely differing approaches the current state of the art algorithms are surprisingly similar with respect to the richness of the scenes they can process. One attribute these algorithms have in common is the use of a conventional passive data base to represent the objects being modeled. This paper postulates and explores the use of an alternative modeling technique which uses procedures to represent the objects being modeled. The properties and structure of such "procedure models" are investigated and an algorithm based on them is presented.</td> </tr> <tr> <td>Type</td> <td class="edit_1507175" data-field="type_t" data-edit="Text">Text</td> </tr> <tr> <td>Publisher</td> <td class="edit_1507175" data-field="publisher_t" data-edit="University of Utah">University of Utah</td> </tr> <tr> <td>Subject</td> <td class="edit_1507175" data-field="subject_t" data-edit="Surfaces; Representation of Algorithms">Surfaces; Representation of Algorithms</td> </tr> <tr> <td>Dissertation Name</td> <td class="edit_1507175" data-field="dissertation_name_t" data-edit="Doctor of Philosophy">Doctor of Philosophy</td> </tr> <tr> <td>Language</td> <td class="edit_1507175" data-field="language_t" data-edit="eng">eng</td> </tr> <tr> <td>Rights Management</td> <td class="edit_1507175" data-field="rights_management_t" data-edit="(c) Martin Edward Newell">(c) Martin Edward Newell</td> </tr> <tr> <td>Format</td> <td data-field="format_t" data-edit="application/pdf">application/pdf</td> </tr> <tr> <td>Format Medium</td> <td class="edit_1507175" data-field="format_medium_t" data-edit="application/pdf">application/pdf</td> </tr> <tr> <td>ARK</td> <td data-field="ark_t" data-edit="ark:/87278/s651906h"><a href="/ark:/87278/s651906h">ark:/87278/s651906h</a></td> </tr> <tr> <td>Setname</td> <td data-field="setname_s" data-edit="ir_etd">ir_etd</td> </tr> <tr> <td>ID</td> <td data-field="id" data-edit="1507175">1507175</td> </tr> <tr> <td>Reference URL</td> <td><a href="https://collections.lib.utah.edu/ark:/87278/s651906h">https://collections.lib.utah.edu/ark:/87278/s651906h</a></td> </tr> </table> </div> </div> </div> <script> contents = document.getElementById("title"); contents.scrollIntoView(); window.onload = function() { download_node = document.getElementById("download"); if(download_node) { download_node.addEventListener("click", function() { log_stat({type:"3",record_ie:"1507175",record_id:"1507175"}, false); }); } // Scroll to item in contents box scroll_box = document.getElementById("scroll-overflow"); child_item = document.getElementById("t_1507175"); if(scroll_box && child_item) scroll_box.scrollTop = child_item.offsetTop - scroll_box.offsetTop + scroll_box.scrollTop; record_video = document.getElementById("record_video"); rebuild_button = document.getElementById("rebuild_button_1507175"); if(record_video && rebuild_button) { rebuild_text = "set video thumbnail ("; rebuild_button.value = rebuild_text + "00:00:00)"; record_video.addEventListener('timeupdate', function(event) { rebuild_button.dataset.time = record_video.currentTime; var date = new Date(record_video.currentTime * 1000); time_value = date.toISOString().substr(11, 8); rebuild_button.value = rebuild_text + time_value + ')'; }); } } function init_drag_events(node) { node.addEventListener('drop', drop, false); node.addEventListener('dragenter', dragenter, false); node.addEventListener('dragleave', dragleave, false); } function toggle_child(owner, id) { node = document.getElementById(id); if(node.style.display == '') { node.style.display = 'none'; owner.children[0].classList.remove("icon-chevron-down"); owner.children[0].classList.add("icon-chevron-right"); } else { node.style.display = ''; owner.children[0].classList.add("icon-chevron-down"); owner.children[0].classList.remove("icon-chevron-right"); } } function hide_sensitive() { document.getElementById("sensitive").style.display = 'none'; document.getElementById("file").style.display = 'block'; if(viewer) { viewer.resize(); viewer.reset_zoom(); } } </script> <footer> <div class="container"> <div class="row"> <div class="twelve columns"><img src="/img/footer_logo_uu.png" alt="Marriott Digital Library Logo"></div> </div> <div class="row footer-4-col"> <div class="three columns"> <p><a href="https://lib.utah.edu">J. 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