#Catt acoustic virus how to#

rotate the whole scene (rooms, listeners, sources) around center along Z axis of 180 degrees.to avoid unnecessary overheads, you may as well disable all optionsДЄfter import of the WRL file in blender, ensure that your scene coordinate system match CATT's original:.In CATT, while the focus is on the main window (the one with the 'Save and Run' button), click on 'File > Export Geometry to > VRML Browser WRL'. This operation is not a feature of the add-on, simply a list of steps to follow if one needs to import an existing CATT model into Blender. Remove default audience plane in CATT, else model import will raise an error because first face in model is not necessarily horizontal (while audience plane should be) Export CATT model to Blender Note: worst case scenario, if the first object processed during the export (can be any in the scene) has a negative scale, and all the others have a positive scale, the normal of all but the first object will be reversed during export. Select the object and use the 'apply scale' operator. If parts of the objects in the scene have their normals that gets inverted during the export (while others don't), it is likely because they have a negative scale. Weird face normal inversion during export Adding a * to the end of a collection name will flag its direct children (only work on 1st level children) objects faces for automatic edge scattering in CATT upon export.

Flag faces for automatic edge scattering in CATTДЄdding a * to the end of an object name will flag its face for automatic edge scattering in CATT upon export. GEO file exported with the option 'Merge Objects' disabled, as enabling this option messes with face ids during export.

To track down those faces CATT reports as non-planar in Blender, use these indices and a.

look for the label Developer and tick the check box Indices.

open the Overlays popover in the 3D View Overlays popover (top right of the 3D view).

(or type .show_developer_ui = True into the Python console).

in the Display panel of the Interface tab, tick Developer Extras.

and/or use the 3D Print add-on, set a low angle into 'distortion' and press the check button to see the ill-conditioned faces.

вЂ“ and/or look in the properties menu (N key) in edit mode, and use 'mesh analysis' > type: distortion, which will let you see the ill-conditioned faces.

in edit mode, select all the mesh faces, go to the mesh menu, then clean up and make planar faces (after switching to face select mode).

If the model contains non-flat faces, it is recommended to either use the add-on 'triangulate faces' option upon export, or to fix the blender meshes using internal tools: Ensure flat facesД¬ATT can only handle flat faces/planes. Use Mesh/Clean Up/Make Planar Faces at your own risk (i.e. Use the Detect non-flat faces utility (after selecting an object in 3d view), coupled with blender internal utility (in edit mode) under Mesh/Clean Up/Split Non-Planar Faces, to manually fix non-flat faces. The 'triangulate faces' option can be used to ensure this condition

inwards for walls, outwards for furnitures)

Faces normals are pointing towards the 'inside' of the scene (e.g.

To comply with how CATT handles geometries, it is suggested to check before export that:

#Catt acoustic virus how to#

See below for instructions on how to display faces ids in blender view port. Plane_name = collection_name-object_name-original_face_id Plane_name is assembled from the name of the collection to which belongs the object (if any), the name of the object, and the original id of the face/plane in blender before export (overwritten during the merge into a single object): GEO file contains a list of objects faces (named 'planes' in CATT) vertices (named 'corners' in CATT) and materials. GEO: sources and receivers will not be taken into account. Upon export, all the objects concerned are merged, and a 'remove duplicate vertices' operation is applied on the resulting mesh. Only those objects in collections not excluded from the view layer will be included in the export. GEO format How to useДЄdd objects to the scene, assign materials to these objects, convert those materials to CATT materials and press the export button. Blender add-on to export scenes to CATT-Acoustic.