Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.

Cycles uses code from some great open source projects, many thanks them:

* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php

1 files changed, 249 insertions, 0 deletions

diff --git a/intern/cycles/blender/blender_camera.cpp b/intern/cycles/blender/blender_camera.cpp
new file mode 100644
index 00000000000..cc4cfda8793
--- /dev/null
+++ b/intern/cycles/blender/blender_camera.cpp
@@ -0,0 +1,249 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "camera.h"
+#include "scene.h"
+
+#include "blender_sync.h"
+#include "blender_util.h"
+
+CCL_NAMESPACE_BEGIN
+
+/* Blender Camera Intermediate: we first convert both the offline and 3d view
+ * render camera to this, and from there convert to our native camera format. */
+
+struct BlenderCamera {
+	float nearclip;
+	float farclip;
+
+	bool ortho;
+	float ortho_scale;
+
+	float lens;
+	float lensradius;
+	float focaldistance;
+
+	float2 shift;
+	float2 offset;
+	float zoom;
+
+	float2 pixelaspect;
+
+	Transform matrix;
+};
+
+static void blender_camera_init(BlenderCamera *bcam)
+{
+	memset(bcam, 0, sizeof(BlenderCamera));
+
+	bcam->zoom = 1.0f;
+	bcam->pixelaspect = make_float2(1.0f, 1.0f);
+}
+
+static float blender_camera_focal_distance(BL::Object b_ob, BL::Camera b_camera)
+{
+	BL::Object b_dof_object = b_camera.dof_object();
+
+	if(!b_dof_object)
+		return b_camera.dof_distance();
+	
+	/* for dof object, return distance along camera direction. this is
+	 * compatible with blender, but does it fit our dof model? */
+	Transform obmat = get_transform(b_ob.matrix_world());
+	Transform dofmat = get_transform(b_dof_object.matrix_world());
+
+	float3 cam_p = transform_get_column(&obmat, 3);
+	float3 cam_dir = normalize(transform_get_column(&obmat, 2));
+	float3 dof_p = transform_get_column(&dofmat, 3);
+	float3 proj_p = dot(dof_p, cam_dir) * cam_dir;
+
+	return len(proj_p - cam_p);
+}
+
+static void blender_camera_from_object(BlenderCamera *bcam, BL::Object b_ob)
+{
+	BL::ID b_ob_data = b_ob.data();
+
+	if(b_ob_data.is_a(&RNA_Camera)) {
+		BL::Camera b_camera(b_ob_data);
+		PointerRNA ccamera = RNA_pointer_get(&b_camera.ptr, "cycles");
+
+		bcam->nearclip = b_camera.clip_start();
+		bcam->farclip = b_camera.clip_end();
+
+		bcam->ortho = (b_camera.type() == BL::Camera::type_ORTHO);
+		bcam->ortho_scale = b_camera.ortho_scale();
+
+		bcam->lens = b_camera.lens();
+		bcam->lensradius = RNA_float_get(&ccamera, "lens_radius");
+		bcam->focaldistance = blender_camera_focal_distance(b_ob, b_camera);
+
+		bcam->shift.x = b_camera.shift_x();
+		bcam->shift.y = b_camera.shift_y();
+	}
+	else {
+		/* from lamp not implemented yet */
+	}
+}
+
+static void blender_camera_sync(Camera *cam, BlenderCamera *bcam, int width, int height)
+{
+	/* copy camera to compare later */
+	Camera prevcam = *cam;
+
+	/* dimensions */
+	float xratio = width*bcam->pixelaspect.x;
+	float yratio = height*bcam->pixelaspect.y;
+
+	/* compute x/y aspect and ratio */
+	float aspectratio, xaspect, yaspect;
+
+	if(xratio > yratio) {
+		aspectratio= xratio/yratio;
+		xaspect= aspectratio;
+		yaspect= 1.0f;
+	}
+	else {
+		aspectratio= yratio/xratio;
+		xaspect= 1.0f;
+		yaspect= aspectratio;
+	}
+
+	/* modify aspect for orthographic scale */
+	if(bcam->ortho) {
+		xaspect = xaspect*bcam->ortho_scale/(aspectratio*2.0f);
+		yaspect = yaspect*bcam->ortho_scale/(aspectratio*2.0f);
+		aspectratio = bcam->ortho_scale/2.0f;
+	}
+
+	/* set viewplane */
+	cam->left = -xaspect;
+	cam->right = xaspect;
+	cam->bottom = -yaspect;
+	cam->top = yaspect;
+
+	/* zoom for 3d camera view */
+	cam->left *= bcam->zoom;
+	cam->right *= bcam->zoom;
+	cam->bottom *= bcam->zoom;
+	cam->top *= bcam->zoom;
+
+	/* modify viewplane with camera shift and 3d camera view offset */
+	float dx = 2.0f*(aspectratio*bcam->shift.x + bcam->offset.x*xaspect*2.0f);
+	float dy = 2.0f*(aspectratio*bcam->shift.y + bcam->offset.y*yaspect*2.0f);
+
+	cam->left += dx;
+	cam->right += dx;
+	cam->bottom += dy;
+	cam->top += dy;
+
+	/* clipping distances */
+	cam->nearclip = bcam->nearclip;
+	cam->farclip = bcam->farclip;
+
+	/* orthographic */
+	cam->ortho = bcam->ortho;
+
+	/* perspective */
+	cam->fov = 2.0f*atan(16.0f/bcam->lens/aspectratio);
+	cam->focaldistance = bcam->focaldistance;
+	cam->lensradius = bcam->lensradius;
+
+	/* transform, note the blender camera points along the negative z-axis */
+	cam->matrix = bcam->matrix * transform_scale(1.0f, 1.0f, -1.0f);
+
+	/* set update flag */
+	if(cam->modified(prevcam))
+		cam->tag_update();
+}
+
+/* Sync Render Camera */
+
+void BlenderSync::sync_camera(int width, int height)
+{
+	BlenderCamera bcam;
+	blender_camera_init(&bcam);
+
+	/* pixel aspect */
+	BL::RenderSettings r = b_scene.render();
+
+	bcam.pixelaspect.x = r.pixel_aspect_x();
+	bcam.pixelaspect.y = r.pixel_aspect_y();
+
+	/* camera object */
+	BL::Object b_ob = b_scene.camera();
+
+	if(b_ob) {
+		blender_camera_from_object(&bcam, b_ob);
+		bcam.matrix = get_transform(b_ob.matrix_world());
+	}
+
+	/* sync */
+	Camera *cam = scene->camera;
+	blender_camera_sync(cam, &bcam, width, height);
+}
+
+/* Sync 3D View Camera */
+
+void BlenderSync::sync_view(BL::SpaceView3D b_v3d, BL::RegionView3D b_rv3d, int width, int height)
+{
+	BlenderCamera bcam;
+	blender_camera_init(&bcam);
+
+	/* 3d view parameters */
+	bcam.nearclip = b_v3d.clip_start();
+	bcam.farclip = b_v3d.clip_end();
+	bcam.lens = b_v3d.lens();
+
+	if(b_rv3d.view_perspective() == BL::RegionView3D::view_perspective_CAMERA) {
+		/* camera view */
+		BL::Object b_ob = b_scene.camera();
+
+		if(b_ob) {
+			blender_camera_from_object(&bcam, b_ob);
+
+			/* magic zoom formula */
+			bcam.zoom = b_rv3d.view_camera_zoom();
+			bcam.zoom = (1.41421f + bcam.zoom/50.0f);
+			bcam.zoom *= bcam.zoom;
+			bcam.zoom = 2.0f/bcam.zoom;
+
+			/* offset */
+			bcam.offset = get_float2(b_rv3d.view_camera_offset());
+		}
+	}
+	else if(b_rv3d.view_perspective() == BL::RegionView3D::view_perspective_ORTHO) {
+		/* orthographic view */
+		bcam.farclip *= 0.5;
+		bcam.nearclip = -bcam.farclip;
+
+		bcam.ortho = true;
+		bcam.ortho_scale = b_rv3d.view_distance();
+	}
+
+	bcam.zoom *= 2.0f;
+
+	/* 3d view transform */
+	bcam.matrix = transform_inverse(get_transform(b_rv3d.view_matrix()));
+
+	/* sync */
+	blender_camera_sync(scene->camera, &bcam, width, height);
+}
+
+CCL_NAMESPACE_END
+