Fisheye effect #4

Open
Open
Fisheye effect#4

Description

@rostidev
rostidev
opened on Dec 27, 2025

I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.

To workaround the fisheye effect I added a focal distance factor:

point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}

You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula

It looks like this:

Image

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Fisheye effect #4
      Open
      Open
      Fisheye effect#4
      Description
      @rostidev
      rostidev
      opened on Dec 27, 2025
      I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
      To workaround the fisheye effect I added a focal distance factor:
      point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
      You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
      It looks like this:
      Image
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Fisheye effect #4
          Open
          Open
          Fisheye effect#4
          Description
          @rostidev
          rostidev
          opened on Dec 27, 2025
          I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
          To workaround the fisheye effect I added a focal distance factor:
          point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
          You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
          It looks like this:
          Image
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
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              No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Fisheye effect #4
              Open
              Open
              Fisheye effect#4
              Description
              @rostidev
              rostidev
              opened on Dec 27, 2025
              I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
              To workaround the fisheye effect I added a focal distance factor:
              point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
              You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
              It looks like this:
              Image
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
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                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Fisheye effect #4
                  Open
                  Open
                  Fisheye effect#4
                  Description
                  @rostidev
                  rostidev
                  opened on Dec 27, 2025
                  I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
                  To workaround the fisheye effect I added a focal distance factor:
                  point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
                  You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
                  It looks like this:
                  Image
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Fisheye effect #4
                      Open
                      Open
                      Fisheye effect#4
                      Description
                      @rostidev
                      rostidev
                      opened on Dec 27, 2025
                      I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
                      To workaround the fisheye effect I added a focal distance factor:
                      point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
                      You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
                      It looks like this:
                      Image
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Fisheye effect #4
                          Open
                          Open
                          Fisheye effect#4
                          Description
                          @rostidev
                          rostidev
                          opened on Dec 27, 2025
                          I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
                          To workaround the fisheye effect I added a focal distance factor:
                          point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
                          You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
                          It looks like this:
                          Image
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            No labels
                            No labels
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              Fisheye effect #4
                              Open
                              Open
                              Fisheye effect#4
                              Description
                              @rostidev
                              rostidev
                              opened on Dec 27, 2025
                              I think the formula is incomplete. How I know this? I've ported your demonstration code to C with SDL3 library and made it showing more than one object. In my case there is one penguin and eight cubes - all rotating together. I've also made it rotating round both xz and yz. With more objects the fisheye effect could be seen better.
                              To workaround the fisheye effect I added a focal distance factor:
                              point_tproject(point3d_tp) {
constfloatfocal=2.5f; // Focal distance of virtual lensreturn (point_t){
x: (p.x / p.z) *focal,
y: (p.y / p.z) *focal
};
}
                              You can find the whole code of this port in my GitHub: https://github.com/rostidev/formula
                              It looks like this:
                              Image
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                No labels
                                No labels
                                Type
                                No type
                                Projects
                                No projects
                                  Milestone
                                  No milestone
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                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions