Kirra draws isochrones over a blast — lines joining collars that fire at the same moment. They are the quickest way to see whether a shot fires the way you drew it, and they are computed from the same resolved fire times the animation and the vibration shaders use.
The same machinery feeds four displays that all share one rule about what a “shot” is:
| Display | Shows |
|---|---|
| Contours | iso-time lines across the pattern |
| First Movement | arrows pointing the way each area moves |
| Burden Relief | how much has already moved before a hole fires |
| Slope | the timing gradient over the pattern |
Each has its own toggle on the display toolbar along the bottom of the window. Click to turn a display on or off.
Right-click a display toggle to open its quick-adjust popover. This is where the settings below live — they are not in the Settings dialog.
This is the part that surprises people, and it changed in v1.1.32.32.
An interpolated field is drawn over a firing event, not over a blast name. Two patterns that fire together are one field, so contours run straight through the join instead of stopping dead at it.
Kirra decides this from structure only, never geometry:
Anything connected by those rules is one field.
A blast is never divided, even if you put its constructs in different firing groups — a firing group can only ever join.
Two things deliberately do not merge blasts:
Hidden blasts are not calculated, and they do not block anything else from being calculated. Hide a blast and it contributes nothing to any field. Hide part of a blast and the field is still computed from every hole that fires — it is only drawn over the holes you can see, so the picture never invents a wavefront where holes used to be.
Right-click the Contours toggle.
The vertical slider on the left. Sets the spacing between iso-lines.
A short interval on a long shot gives you a dense plot; a long interval gives you bands you can count across a bench. The labels follow whatever you choose.
| Option | Uses |
|---|---|
| Fire Time (default) | the ultimate detonation time — surface delay plus everything downhole |
| Surface | the connector arrival time only |
For a design with no downhole timing the two are the same. For electronic or multi-deck designs they are not, and Fire Time is the one that matches what comes out of the ground.
Two wells. A contour line is one line in two colours — each iso-line is drawn as a dash run that alternates between them along its length. That is what keeps it readable on both the dark canvas and a white printed page, so both wells matter.
Reset restores the shipped yellow and magenta. It only resets the colours in this popover.
| Control | Does |
|---|---|
| Size | label font size, 6–32 px |
| Count | how many labels each contour line carries, 0–10 |
Count is the spacing control. The default of 2 is the long-standing behaviour — a label about a third and two thirds of the way along each line. Raise it on a wide plan, drop it to 0 to hide labels entirely on a dense one.
Right-click the First Movement toggle.
The arrows are an indication of movement direction, not a modelled throw.
Colours, label size and label count are saved in your browser and survive a reload. They are per-machine, not part of the project file, so two people opening the same KAP can have different plot colours without disagreeing about the design.
Everything above applies to the printed plan as well as the screen — raster print, the inbuilt vector plot, and an XLSX template map view all read the same settings. If you set a 250 ms interval and green contours, that is what comes out of the PDF.
Fixed in v1.1.32.36: the interval slider previously drove the 2D canvas only, so 3D and every printed plan silently fell back to their own default. If you have older plans that disagree with the screen, that is why.