Click the green flag, then: 1-5 = switch shape (Cube, Icosahedron, Gem, Torus, Sphere) M = Wireframe / Solid C = change color theme Drag with the mouse or use the arrow keys = rotate W / S = zoom in / out Space = auto-spin on/off Tip: Torus and Sphere in Solid mode are the heaviest. If it runs slowly, press M for Wireframe, or shift-click the green flag to turn on Turbo Mode.
A real 3D engine built only with Scratch blocks and the Pen extension, with no 3D extensions. How it works: every frame, each vertex is rotated around two axes and projected with perspective. In Solid mode, back faces are hidden, faces are sorted far to near (painter's algorithm) and filled with flat shading plus a specular highlight. The neon floor and shadow are drawn with pen lines. Everything runs inside "run without screen refresh" custom blocks, so feel free to open it up and see how it works. Remixes are welcome, and please credit this project if you do! ======================================== #3d #engine #pen #wireframe #solid #lighting #shading #perspective #synthwave #neon
