- Xmas special: shiny mirroring bells & whistles!

This is a revision of the old NeoGeo raytracer, dusted off, improved quite
a lot, and nicely integrated in the rest of rendering pipeline.
Enable it with F10-"Ray", and set either a 'ray-shadow' lamp or give the
Material a "RayMirror" value.
It has been added for 2 reasons:
- get feedback on validity... I need artists to play around with it if it's
  actually useful. It still *is* raytracing, meaning complex scenes will
  easily become slow.
- for educational purposes. All raytracing happens in ray.c, which can be
  quite easily adjusted for other effects.

When too many disasters pop up with this, I'll make it a compile #ifdef.
But so far, it seems to do a decent job.

Demo files: http://www.blender.org/docs/ray_test.tgz
An article (tech) about how it works, and about the new octree invention
will be posted soon. :)

Note: it doesn't work with unified render yet.

source/blender/makesdna/DNA_lamp_types.h

@@ -56,6 +56,9 @@ typedef struct Lamp {
 	float clipsta, clipend, shadspotsize;
 	float bias, soft;
 	
+	short ray_samp, pad;
+	float ray_soft;
+	
 	/* texact is for buttons */
 	short texact, shadhalostep;
 	
@@ -88,6 +91,7 @@ typedef struct Lamp {
 #define LA_DEEP_SHADOW  1024
 #define LA_NO_DIFF		2048
 #define LA_NO_SPEC		4096
+#define LA_SHAD_RAY		8192
 
 /* mapto */
 #define LAMAP_COL		1

source/blender/makesdna/DNA_material_types.h

@@ -54,9 +54,10 @@ typedef struct Material {
 	float mirr, mirg, mirb;
 	float ambr, ambb, ambg;
 	
-	float amb, emit, ang, spectra;
+	float amb, emit, ang, spectra, ray_mirror;
 	float alpha, ref, spec, zoffs, add;
 	float kfac; /* for transparent solids */
+	short ray_depth, pad1;
 	short har;
 	char seed1, seed2;
 	
@@ -82,7 +83,7 @@ typedef struct Material {
 	/* dynamic properties */
 	float friction, fh, reflect;
 	float fhdist, xyfrict;
-	short dynamode, pad;
+	short dynamode, pad2;
 	
 	ScriptLink scriptlink;
 } Material;

source/blender/makesdna/DNA_scene_types.h

@@ -174,12 +174,13 @@ typedef struct RenderData {
 	 * 9: borders                                                            
 	 * 10: panorama                                                          
 	 * 11: crop                                                              
-	 * 12: save SGI movies with Cosmo hardware (????)                        
-	 * 13: odd field first rendering                                         
-	 * 14: motion blur                                                       
-	 * 15: use unified renderer for this pic!                                
+	 * 12: save SGI movies with Cosmo hardware
+	 * 13: odd field first rendering                  
+	 * 14: motion blur                                         
+	 * 15: use unified renderer for this pic
+	 * 16. enable raytracing
 	 */
-	short mode;
+	int mode;
 
 	/**
 	 * What to do with the sky/background. Picks sky/premul/key
@@ -199,7 +200,7 @@ typedef struct RenderData {
 
 	/** For unified renderer: reduce intensity on boundaries with
 	 * identical materials with this number.*/
-	short same_mat_redux, pad_3[3];
+	short same_mat_redux, pad_3[2];
 	
 	/**
 	 * The gamma for the normal rendering. Used when doing
@@ -263,7 +264,7 @@ typedef struct Scene {
 #define R_FRONTBUF		4
 #define R_FRONTBUFANIM	8
 
-/* mode */
+/* mode (int now) */
 #define R_OSA			0x0001	
 #define R_SHADOW		0x0002	
 #define R_GAMMA			0x0004
@@ -277,10 +278,10 @@ typedef struct Scene {
 #define R_PANORAMA		0x0400
 #define R_MOVIECROP		0x0800
 #define R_COSMO			0x1000
-/* these difines were different between IrisGL and OpenGL!!! */
 #define R_ODDFIELD		0x2000
 #define R_MBLUR			0x4000
 #define R_UNIFIED       0x8000
+#define R_RAYTRACE      0x10000
 
 /* scemode */
 #define R_DOSEQ			0x0001