X-Git-Url: http://www2.svjatoslav.eu/gitweb/?p=sixth-3d-demos.git;a=blobdiff_plain;f=doc%2Findex.org;h=1375cac0a6288dcc63c08eb54ca9a3713bbeb77f;hp=133387309386f1634bd165b9de789587059601d2;hb=151ac55eaaa0f3a2d7a589a0a3ff877b6db09a6f;hpb=3faa9ebcc7e643181ec70a26a69ba1dbd40e6ab6

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-* Description
-Goal of this project is to show off capabilities of [[http://www2.svjatoslav.eu/gitbrowse/sixth-3d/doc/index.html][Sixth 3D]]
-engine. Also to show examples of its usage.
+* Overview
+Goal of this project is to show off capabilities and API usage of
+[[http://www2.svjatoslav.eu/gitbrowse/sixth-3d/doc/index.html][Sixth 3D]] engine.
 
-[[file:screenshots/index.html][file:screenshots.png]]
+All sample scenes below are rendered at interactive framerates.
+* Navigating in space
+| key                            | result                               |
+|--------------------------------+--------------------------------------|
+| cursor keys                    | move: left, right, forward, backward |
+| mouse scroll wheel             | move: up, down                       |
+| dragging with mouse            | look around                          |
 
-Sample scenes rendered at interactive framerates by Sixth 3D engine.
+* Samples
+** Raytracing through voxels
+[[file:screenshots/raytracing fractal in voxel polygon hybrid scene.png]]
+
+Test scene that is generated simultaneously using:
++ conventional polygons
+  + for realtime navigation, and
++ voxels
+  + for on-demand raytracing
+
+Instead of storing voxels in dumb [X * Y * Z] array, dynamically
+partitioned [[https://en.wikipedia.org/wiki/Octree][octree]] is used to compress data. Press "r" key anywhere in
+the scene to raytrace current view through compressed voxel
+datastructure.
+
+** Conway's Game of Life
+The Game of Life, also known simply as Life, is a cellular automaton
+devised by the British mathematician John Horton Conway in 1970.
+
++ https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life
+  + Game rules:
+    + 2 cell states: alive / dead
+    + Each cell sees 8 neighboring cells.
+    + If alive cell neighbors count is 2 or 3, then cell survives,
+      otherwise it dies.
+    + Dead cell becomes alive if neighbors count is exactly 3.
+
+[[file:screenshots/life.png]]
+
+Current application projects 2D game grid/matrix onto three
+dimensional space. Extra dimension (height) is used to visualize
+history (previous iterations) using glowing dots suspended in space.
+
+Usage:
+| key                            | result                               |
+|--------------------------------+--------------------------------------|
+| mouse click on the cell (cell) | toggles cell state                   |
+| <space>                        | next iteration                       |
+| ENTER                          | next iteeration with the history     |
+| "c"                            | clear the matrix                     |
+
+** Text editors
+[[file:screenshots/text editors.png]]
+
+Initial test for creating user interfaces in 3D and:
++ window focus handling
++ picking objecs using mouse
++ redirecting keyboard input to focused window
+
+
+Window focus acts like a stack.
+
+When window is clicked with the mouse, previously focused window (if
+any) is pushed to the focus stack and new window receives focus. Red
+frame appears around the window to indicate this.
+
+When ESC key is pressed, window focus is returned to previous window
+(if any).
+
+When any window is focused, all keyboard input is redirected to that
+window, including cursor keys. To be able to navigate around the world
+again, window must be unfocused first using ESC key.
+
+
++ TODO:
+  + Improve focus handling:
+    + Perhaps add shortcut to navigate world without exiting entire
+      stack of focus.
+    + Possibility to retain and reuse recently focused elements.
+    + Store user location in the world and view direction with the
+      focused window. So that when returning focus to far away object,
+      user is redirected also to proper location in the world.
+  + Possibility to store recently visited locations in the world and
+    return to them.
+** Mathematical formulas
+[[file:screenshots/mathematical formulas.png]]
+
++ TODO: instead of projecting 2D visualizations onto 3D space,
+  visualize some formula using all 3 dimensions avaliable.
+** Sinus heightmaps and sphere
+[[file:screenshots/sinus heightmaps and sphere.png]]
+
+Simple test scene. Easy to implement and looks nice.