ComfyUI Node: DA3 Create Camera Parameters

DA3 Create Camera Parameters:

The DA3_CreateCameraParams node is designed to generate camera parameters that are crucial for conditioning depth estimation in the DA3 framework. By providing known camera poses, this node enhances the accuracy of depth estimation, which is particularly beneficial in scenarios where precise depth information is required. The node allows you to define the camera's position and orientation in the world space, as well as its intrinsic properties like focal length and field of view. This flexibility ensures that the depth estimation process can be tailored to specific needs, improving the reliability of the results. The node outputs a set of camera parameters that include both extrinsic and intrinsic matrices, which are essential for accurate depth mapping and 3D scene reconstruction.

DA3 Create Camera Parameters Input Parameters:

image_width

The image_width parameter specifies the width of the image for which the camera parameters are being created. It is an integer value with a default of 512, and it can range from 1 to 8192. This parameter is crucial as it influences the aspect ratio and scaling of the camera's field of view.

image_height

The image_height parameter defines the height of the image for which the camera parameters are being generated. Similar to image_width, it is an integer with a default value of 512, and it can vary between 1 and 8192. This parameter, along with image_width, determines the aspect ratio of the camera's view.

cam_x

The cam_x parameter represents the camera's position along the X-axis in world space. It is a floating-point value with a default of 0.0, and it can range from -100.0 to 100.0. Adjusting this parameter changes the horizontal position of the camera, affecting the perspective of the depth estimation.

cam_y

The cam_y parameter indicates the camera's position along the Y-axis in world space. It is a float with a default value of 0.0, and it can range from -100.0 to 100.0. This parameter controls the vertical positioning of the camera, influencing the angle of view.

cam_z

The cam_z parameter specifies the camera's position along the Z-axis in world space. It is a floating-point number with a default of 0.0, and it can range from -100.0 to 100.0. This parameter affects the depth positioning of the camera, impacting the scale and depth perception in the scene.

rot_x

The rot_x parameter defines the camera's rotation around the X-axis, expressed in Euler angles in degrees. It is a float with a default of 0.0, and it can range from -180.0 to 180.0. This parameter adjusts the tilt of the camera, altering the vertical perspective.

rot_y

The rot_y parameter represents the camera's rotation around the Y-axis, given in Euler angles in degrees. It is a floating-point value with a default of 0.0, and it can range from -180.0 to 180.0. This parameter changes the pan of the camera, affecting the horizontal perspective.

rot_z

The rot_z parameter indicates the camera's rotation around the Z-axis, in Euler angles in degrees. It is a float with a default of 0.0, and it can range from -180.0 to 180.0. This parameter controls the roll of the camera, influencing the orientation of the image.

focal_length

The focal_length parameter specifies the camera's focal length. It is a floating-point number with a default of 0.0, and it can range from 0.0 to 10000.0. If set to a value greater than 0, this parameter overrides the field of view, providing a more precise control over the camera's zoom level.

fov_degrees

The fov_degrees parameter defines the camera's field of view in degrees. It is a float with a default of 60.0, and it can range from 1.0 to 180.0. This parameter is used when focal_length is set to 0, determining the extent of the observable world that is visible through the camera.

DA3 Create Camera Parameters Output Parameters:

camera_params

The camera_params output is a dictionary containing the camera's extrinsic and intrinsic matrices. The extrinsic matrix is a 4x4 matrix that describes the camera's position and orientation in world space, while the intrinsic matrix is a 3x3 matrix that defines the camera's internal characteristics, such as focal length and principal point. These matrices are essential for accurately mapping the 3D world onto a 2D image plane, enabling precise depth estimation and 3D reconstruction.

DA3 Create Camera Parameters Usage Tips:

• To achieve the best depth estimation results, ensure that the camera's position and orientation parameters (cam_x, cam_y, cam_z, rot_x, rot_y, rot_z) are set to reflect the actual setup of your scene.
• Use the focal_length parameter for precise control over the camera's zoom level, especially in scenarios where the field of view needs to be tightly controlled.
• If you are unsure about the focal length, set it to 0 and adjust the fov_degrees to get a broader or narrower view of the scene.

DA3 Create Camera Parameters Common Errors and Solutions:

Invalid image dimensions

• Explanation: The image_width or image_height values are outside the allowed range.
• Solution: Ensure that both image_width and image_height are set between 1 and 8192.

Camera position out of bounds

• Explanation: The cam_x, cam_y, or cam_z values exceed the specified limits.
• Solution: Adjust the camera position parameters to be within the range of -100.0 to 100.0.

Rotation angle out of range

• Explanation: The rot_x, rot_y, or rot_z values are not within the valid range.
• Solution: Ensure that the rotation angles are set between -180.0 and 180.0 degrees.

Focal length or FOV not set correctly

• Explanation: Both focal_length and fov_degrees are set to inappropriate values.
• Solution: Set focal_length to a positive value if you want to use it, otherwise ensure fov_degrees is between 1.0 and 180.0.