Loonim - Revision history

151.229.136.200: /* Physically based rendering */

2017-03-27T19:40:28Z

‎Physically based rendering

151.229.136.200 at 19:39, 27 March 2017

2017-03-27T19:39:58Z

151.229.136.200: Created page with "Loonim is a runtime procedural texture engine, using either the CPU or the GPU to draw graphics (GPU is the default). It's primarily used for complex image effects (e.g. the -..."

2017-03-27T19:05:01Z

Created page with "Loonim is a runtime procedural texture engine, using either the CPU or the GPU to draw graphics (GPU is the default). It's primarily used for complex image effects (e.g. the -..."

New page

Loonim is a runtime procedural texture engine, using either the CPU or the GPU to draw graphics (GPU is the default). It's primarily used for complex image effects (e.g. the -spark-filter CSS property) as well as the underlying rendering engine for SVG.

Loonim is designed to be used directly - to generate flooring or wallpaper textures too, for example.

== Nodes, graphs, surface textures, filtering and textures - what? ==

To avoid unnecessary confusion, let's quickly define what these actually are:

* A Loonim node is one of the many available operations that you can use whilst building up an image effect. There's over 110 of them - Add nodes, sepia nodes etc. A node accepts zero or more inputs, performs some operation, then has one output.

* A Loonim graph is the graph that forms by combining multiple Loonim nodes.

* A 'filter' aka a 'surface texture' is a complete Loonim graph with runtime definable properties. These are represented with the SurfaceTexture class. For example, you might have a filter which adds a sepia effect to an image - it will always have an image input property (the image to apply the effect to) as well as e.g. a variable sepia intensity property.

Whilst 'filter' and 'surface texture' are typically used interchangeably, there's a slight difference - a 'filter' always has at least one image input property called 'source0' (the image to apply the effect to).

== HDR ==

The Loonim image pipeline requires high dynamic range (HDR) support but it can attempt to work without it. Typically if your platform does not support HDR and Loonim is set to use HDR, you will often see unusual colouring (The advanced Loonim example scene seems to regularly turn red when this happens). To force Loonim to attempt to work without HDR, turn it off in your DrawInfo:

<syntaxhighlight lang="csharp">

myDrawInfo.HDR=false;

</syntaxhighlight>

@@ Line 27: / Line 27: @@
 == Physically based rendering ==
-Loonim surface textures can output multiple channels via the 'Output' node.
+Loonim surface textures can output multiple channels (such as normals, a heightmap etc) via the 'Output' node.
 == File format ==
 Loonim describes a very simplistic binary file format (.lim) which can be used to save/ load/ share Loonim surface textures.

@@ Line 7: / Line 7: @@
 To avoid unnecessary confusion, let's quickly define what these actually are:
-* A Loonim node is one of the many available operations that you can use whilst building up an image effect. There's over 110 of them - Add nodes, sepia nodes etc. A node accepts zero or more inputs, performs some operation, then has one output.
+* A ''''Loonim node'''' is one of the many available operations that you can use whilst building up an image effect. There's over 110 of them - Add nodes, sepia nodes etc. A node accepts zero or more inputs, performs some operation, then has one output.
-* A Loonim graph is the graph that forms by combining multiple Loonim nodes.
+* A ''''Loonim graph'''' is the graph that forms by combining multiple Loonim nodes.
-* A 'filter' aka a 'surface texture' is a complete Loonim graph with runtime definable properties. These are represented with the SurfaceTexture class. For example, you might have a filter which adds a sepia effect to an image - it will always have an image input property (the image to apply the effect to) as well as e.g. a variable sepia intensity property.
+* A ''''filter'''' aka a ''''surface texture'''' is a complete Loonim graph with runtime definable properties. These are represented with the SurfaceTexture class. For example, you might have a filter which adds a sepia effect to an image - it will always have an image input property (the image to apply the effect to) as well as e.g. a variable sepia intensity property.
 Whilst 'filter' and 'surface texture' are typically used interchangeably, there's a slight difference - a 'filter' always has at least one image input property called 'source0' (the image to apply the effect to).
@@ Line 24: / Line 24: @@
 </syntaxhighlight>