To learn about Audio and Hotspots, watch the video or above, or read the following:
Assuming you've visited The Interactivity section on the support docs, you're ready to start editing your audio file. This means you've added a node to the timeline, and created a audio file on the timeline. This also means you have uploaded an audio file to the asset section of the CMS.
1. Control click the audio file on your timeline, and click edit. This will bring up the detail page for the audio file.
2. Select your audio file on the right where it says "select assets" from your list of uploaded assets.
3. To start, your "Trigger Type" on the top right is set to Automatic, meaning it will begin playing your audio file at the "Start time," on the top left. Your duration will automatically be set to the length of the audio clip selected. You can change the duration as you see fit. The audio transitions will be set to none, and your volume will exist at 100%. You can adjust both of those freely as you see fit.
4. To review:
Start Time: is the time into the node at which the audio clip becomes active to play or begins playing.
Trigger Type: the method for playing an audio file, based on either time, or a viewers gaze.
Duration: the length of the audio asset as it plays, setting a shorter duration will cut the audio off early. A 0 duration implies the length of the asset.
Audio Transition: determines whether or not the audio fades in / fades out in seconds. (i.e. .5 = over half a second).
Volume: a percent of how loud the audio will be based on it's original dB levels.
7. You will need to select what type of audio file you are working with. To start, the type of audio will be set as standard, meaning it will play your file in its existing 2d audio format with no positional effects. There are four types of audio our system takes:
Standard: results in 2D audio with no positional effects.
Point: creates positional audio that is played at a point in 3D space (values are in meters, 1 = 1 meter). Coordinate system conforms to the following diagram:
You can use the point audio option to easily add spatial audio to your content even if you only have mono and stereo audio tracks.
EPP (Equal Power Panning): places audio within a 360° of the user. The rotation is in counterclockwise position. i.e. 90° = to the left.
Ambisonics B-Format: this option allows you to add any audio recorded using the Ambisonics B-Format, which is a full sphere surround sound technique.
8. You can add some extra layers of interaction to your trigger using a advanced hotspot. This will give you three new options. The first of which is "Volume Only". You want to use this option when you want your hotspot based audio to begin playing at the start time on the top left, instead of based on when a user looks at it. Your user won't be able to hear the audio file though unless they are looking at the hotspot. Imagine this for a story where can hear someone's thoughts by looking at them, but you want that thought to be playing and continue playing whether a user is watching that character at the moment or not.
Next is "Stop on gaze out". This option makes it so an audio file will stop playing when a user looks away from the area the hotspot covers, allowing you to turn audio off when it's not relevant to where a user is looking.
Finally we have times triggerable. This determines how many times a user can look at a hotspot after looking away to trigger the audio file again. In this case, setting it to zero, means infinite, allowing a user to trigger the audio file every time they look at it. Incase you want to do something like playing the drums.