Cycles: seed value to get different noise values from renders, there was a patch

for this but I've implemented it differently.

intern/cycles/blender/addon/properties.py

@@ -78,6 +78,9 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
         cls.filter_width = FloatProperty(name="Filter Width", description="Pixel filter width",
             default=1.5, min=0.01, max=10.0)
 
+        cls.seed = IntProperty(name="Seed", description="Seed value for integrator to get different noise patterns",
+            default=0, min=0, max=2147483647)
+
         cls.debug_tile_size = IntProperty(name="Tile Size", description="",
             default=1024, min=1, max=4096)
         cls.debug_min_size = IntProperty(name="Min Size", description="",

intern/cycles/blender/addon/ui.py

@@ -62,13 +62,13 @@ class CyclesRender_PT_integrator(CyclesButtonsPanel, Panel):
         sub.label(text="Samples:")
         sub.prop(cscene, "samples", text="Render")
         sub.prop(cscene, "preview_samples", text="Preview")
+        sub.prop(cscene, "seed")
 
         sub = col.column(align=True)
         sub.label("Transparency:")
         sub.prop(cscene, "transparent_max_bounces", text="Max")
         sub.prop(cscene, "transparent_min_bounces", text="Min")
         sub.prop(cscene, "use_transparent_shadows", text="Shadows")
-        sub.prop(cscene, "no_caustics")
 
         col = split.column()
 
@@ -82,6 +82,7 @@ class CyclesRender_PT_integrator(CyclesButtonsPanel, Panel):
         sub.prop(cscene, "diffuse_bounces", text="Diffuse")
         sub.prop(cscene, "glossy_bounces", text="Glossy")
         sub.prop(cscene, "transmission_bounces", text="Transmission")
+        sub.prop(cscene, "no_caustics")
 
         #row = col.row()
         #row.prop(cscene, "blur_caustics")

intern/cycles/blender/blender_sync.cpp

@@ -151,6 +151,8 @@ void BlenderSync::sync_integrator()
 	integrator->no_caustics = get_boolean(cscene, "no_caustics");
 	integrator->blur_caustics = get_float(cscene, "blur_caustics");
 
+	integrator->seed = get_int(cscene, "seed");
+
 	if(integrator->modified(previntegrator))
 		integrator->tag_update(scene);
 }

intern/cycles/kernel/kernel_random.h

@@ -128,11 +128,15 @@ __device_inline void path_rng_init(KernelGlobals *kg, __global uint *rng_state,
 
 	*rng = sobol_lookup(bits, frame, x, y, &px, &py);
 
+	*rng ^= kernel_data.integrator.seed;
+
 	*fx = size * (float)px * (1.0f/(float)0xFFFFFFFF) - x;
 	*fy = size * (float)py * (1.0f/(float)0xFFFFFFFF) - y;
 #else
 	*rng = rng_state[x + y*kernel_data.cam.width];
 
+	*rng ^= kernel_data.integrator.seed;
+
 	*fx = path_rng(kg, rng, sample, PRNG_FILTER_U);
 	*fy = path_rng(kg, rng, sample, PRNG_FILTER_V);
 #endif
@@ -159,6 +163,8 @@ __device void path_rng_init(KernelGlobals *kg, __global uint *rng_state, int sam
 	/* load state */
 	*rng = rng_state[x + y*kernel_data.cam.width];
 
+	*rng ^= kernel_data.integrator.seed;
+
 	*fx = path_rng(kg, rng, sample, PRNG_FILTER_U);
 	*fy = path_rng(kg, rng, sample, PRNG_FILTER_V);
 }

intern/cycles/kernel/kernel_types.h

@@ -362,7 +362,6 @@ typedef struct KernelIntegrator {
 	int num_all_lights;
 	float pdf_triangles;
 	float pdf_lights;
-	float pdf_pad;
 
 	/* bounces */
 	int min_bounce;
@@ -380,6 +379,9 @@ typedef struct KernelIntegrator {
 	/* caustics */
 	int no_caustics;
 	float blur_caustics;
+
+	/* seed */
+	int seed;
 } KernelIntegrator;
 
 typedef struct KernelBVH {

intern/cycles/render/integrator.cpp

@@ -21,6 +21,8 @@
 #include "scene.h"
 #include "sobol.h"
 
+#include "util_hash.h"
+
 CCL_NAMESPACE_BEGIN
 
 Integrator::Integrator()
@@ -41,6 +43,8 @@ Integrator::Integrator()
 	no_caustics = false;
 	blur_caustics = 0.0f;
 
+	seed = 0;
+
 	need_update = true;
 }
 
@@ -79,6 +83,8 @@ void Integrator::device_update(Device *device, DeviceScene *dscene)
 	kintegrator->no_caustics = no_caustics;
 	kintegrator->blur_caustics = blur_caustics;
 
+	kintegrator->seed = hash_int(seed);
+
 	/* sobol directions table */
 	int dimensions = PRNG_BASE_NUM + (max_bounce + transparent_max_bounce + 2)*PRNG_BOUNCE_NUM;
 	uint *directions = dscene->sobol_directions.resize(SOBOL_BITS*dimensions);
@@ -109,7 +115,8 @@ bool Integrator::modified(const Integrator& integrator)
 		transparent_probalistic == integrator.transparent_probalistic &&
 		transparent_shadows == integrator.transparent_shadows &&
 		no_caustics == integrator.no_caustics &&
-		blur_caustics == integrator.blur_caustics);
+		blur_caustics == integrator.blur_caustics &&
+		seed == integrator.seed);
 }
 
 void Integrator::tag_update(Scene *scene)

intern/cycles/render/integrator.h

@@ -42,6 +42,9 @@ public:
 
 	bool no_caustics;
 	float blur_caustics;
+
+	int seed;
+
 	bool need_update;
 
 	Integrator();

intern/cycles/util/util_hash.h

@@ -44,6 +44,11 @@ static unsigned int hash_int_2d(unsigned int kx, unsigned int ky)
 	#undef rot
 }
 
+static unsigned int hash_int(unsigned int k)
+{
+	return hash_int_2d(k, 0);
+}
+
 CCL_NAMESPACE_END
 
 #endif /* __UTIL_HASH_H__ */