Smoke: add temperature grid, with values 0..1 corresponding to 0..1000K.

intern/cycles/blender/blender_mesh.cpp

@@ -367,6 +367,8 @@ static void create_mesh_volume_attributes(Scene *scene,
 		create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_FLAME, frame);
 	if(mesh->need_attribute(scene, ATTR_STD_VOLUME_HEAT))
 		create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_HEAT, frame);
+	if(mesh->need_attribute(scene, ATTR_STD_VOLUME_TEMPERATURE))
+		create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_TEMPERATURE, frame);
 	if(mesh->need_attribute(scene, ATTR_STD_VOLUME_VELOCITY))
 		create_mesh_volume_attribute(b_ob, mesh, scene->image_manager, ATTR_STD_VOLUME_VELOCITY, frame);
 }

intern/cycles/blender/blender_session.cpp

@@ -1066,7 +1066,8 @@ void BlenderSession::builtin_image_info(const string &builtin_name,
 
 		if(builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_DENSITY) ||
 		   builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_FLAME) ||
-		   builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_HEAT))
+		   builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_HEAT) ||
+		   builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_TEMPERATURE))
 			channels = 1;
 		else if(builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_COLOR))
 			channels = 4;
@@ -1287,6 +1288,13 @@ bool BlenderSession::builtin_image_float_pixels(const string &builtin_name,
 				return true;
 			}
 		}
+		else if(builtin_name == Attribute::standard_name(ATTR_STD_VOLUME_TEMPERATURE)) {
+			SmokeDomainSettings_temperature_grid_get_length(&b_domain.ptr, &length);
+			if(length == num_pixels) {
+				SmokeDomainSettings_temperature_grid_get(&b_domain.ptr, pixels);
+				return true;
+			}
+		}
 		else {
 			fprintf(stderr,
 			        "Cycles error: unknown volume attribute %s, skipping\n",

intern/cycles/kernel/kernel_types.h

@@ -798,6 +798,7 @@ typedef enum AttributeStandard {
 	ATTR_STD_VOLUME_COLOR,
 	ATTR_STD_VOLUME_FLAME,
 	ATTR_STD_VOLUME_HEAT,
+	ATTR_STD_VOLUME_TEMPERATURE,
 	ATTR_STD_VOLUME_VELOCITY,
 	ATTR_STD_POINTINESS,
 	ATTR_STD_NUM,

intern/cycles/render/attribute.cpp

@@ -281,6 +281,8 @@ const char *Attribute::standard_name(AttributeStandard std)
 			return "flame";
 		case ATTR_STD_VOLUME_HEAT:
 			return "heat";
+		case ATTR_STD_VOLUME_TEMPERATURE:
+			return "temperature";
 		case ATTR_STD_VOLUME_VELOCITY:
 			return "velocity";
 		case ATTR_STD_POINTINESS:
@@ -425,6 +427,7 @@ Attribute *AttributeSet::add(AttributeStandard std, ustring name)
 			case ATTR_STD_VOLUME_DENSITY:
 			case ATTR_STD_VOLUME_FLAME:
 			case ATTR_STD_VOLUME_HEAT:
+			case ATTR_STD_VOLUME_TEMPERATURE:
 				attr = add(name, TypeDesc::TypeFloat, ATTR_ELEMENT_VOXEL);
 				break;
 			case ATTR_STD_VOLUME_COLOR:

source/blender/makesrna/intern/rna_smoke.c

@@ -362,6 +362,42 @@ static void rna_SmokeModifier_heat_grid_get(PointerRNA *ptr, float *values)
 #endif
 }
 
+static void rna_SmokeModifier_temperature_grid_get(PointerRNA *ptr, float *values)
+{
+#ifdef WITH_SMOKE
+	SmokeDomainSettings *sds = (SmokeDomainSettings *)ptr->data;
+	int length[RNA_MAX_ARRAY_DIMENSION];
+	int size = rna_SmokeModifier_grid_get_length(ptr, length);
+	float *flame;
+
+	BLI_rw_mutex_lock(sds->fluid_mutex, THREAD_LOCK_READ);
+
+	if (sds->flags & MOD_SMOKE_HIGHRES && sds->wt) {
+		flame = smoke_turbulence_get_flame(sds->wt);
+	}
+	else {
+		flame = smoke_get_flame(sds->fluid);
+	}
+
+	if (flame) {
+		/* Output is such that 0..1 maps to 0..1000K */
+		float offset = sds->flame_ignition;
+		float scale = sds->flame_max_temp - sds->flame_ignition;
+
+		for (int i = 0; i < size; i++) {
+			values[i] = (flame[i] > 0.01f) ? offset + flame[i] * scale : 0.0f;
+		}
+	}
+	else {
+		memset(values, 0, size * sizeof(float));
+	}
+
+	BLI_rw_mutex_unlock(sds->fluid_mutex);
+#else
+	UNUSED_VARS(ptr, values);
+#endif
+}
+
 static void rna_SmokeFlow_density_vgroup_get(PointerRNA *ptr, char *value)
 {
 	SmokeFlowSettings *flow = (SmokeFlowSettings *)ptr->data;
@@ -677,6 +713,14 @@ static void rna_def_smoke_domain_settings(BlenderRNA *brna)
 	RNA_def_property_float_funcs(prop, "rna_SmokeModifier_heat_grid_get", NULL, NULL);
 	RNA_def_property_ui_text(prop, "Heat Grid", "Smoke heat grid");
 
+	prop = RNA_def_property(srna, "temperature_grid", PROP_FLOAT, PROP_NONE);
+	RNA_def_property_array(prop, 32);
+	RNA_def_property_flag(prop, PROP_DYNAMIC);
+	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
+	RNA_def_property_dynamic_array_funcs(prop, "rna_SmokeModifier_grid_get_length");
+	RNA_def_property_float_funcs(prop, "rna_SmokeModifier_temperature_grid_get", NULL, NULL);
+	RNA_def_property_ui_text(prop, "Temperature Grid", "Smoke temperature grid, range 0..1 represents 0..1000K");
+
 	prop = RNA_def_property(srna, "cell_size", PROP_FLOAT, PROP_XYZ); /* can change each frame when using adaptive domain */
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 	RNA_def_property_ui_text(prop, "cell_size", "Cell Size");