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Is there a numerical relationship between $MaliRayTracingIntersectionsOpaqueTriangleHits and $MaliRayTracingIntersectionsRayMisses and $MaliRayTracingTriangleBatchesTested？

greenhander

in mobile studio Streamline data，I found that $MaliRayTracingIntersectionsOpaqueTriangleHits and $MaliRayTracingIntersectionsRayMisses represent the number of hits and misses that the triangle intersects with the ray.

and $MaliRayTracingTriangleBatchesTested represents the time when the triangle intersection test is.

There are no transparent objects in the scene. And the firstHit is not set.

So I understand that the sum of $MaliRayTracingIntersectionsOpaqueTriangleHits and $MaliRayTracingIntersectionsRayMisses should be equal to $MaliRayTracingTriangleBatches  * 16. However, the actual situation is not completely consistent, how to understand the relationship between these items?

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  • 0 in reply to Peter Harris

    If divergence exists, there should be no "$MaliRayTracingTriangleBatches x 16 < $MaliRayTracingIntersectionsOpaqueTriangleHits + $MaliRayTracingIntersectionsRayMisses" scenario?

    I had a test where only 1 square was left in the scene, consisting of 2 triangles, and the light was evenly directed towards the square.
    The $MaliRayTracingTriangleBatches*16 I ended up with was much smaller than $MaliRayTracingIntersectionsOpaqueTriangleHits + $MaliRayTracingIntersectionsRayMisses. What could have caused this?

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  • 0 in reply to Peter Harris

    If divergence exists, there should be no "$MaliRayTracingTriangleBatches x 16 < $MaliRayTracingIntersectionsOpaqueTriangleHits + $MaliRayTracingIntersectionsRayMisses" scenario?

    I had a test where only 1 square was left in the scene, consisting of 2 triangles, and the light was evenly directed towards the square.
    The $MaliRayTracingTriangleBatches*16 I ended up with was much smaller than $MaliRayTracingIntersectionsOpaqueTriangleHits + $MaliRayTracingIntersectionsRayMisses. What could have caused this?

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  • +1 Arm Employee Badge in reply to greenhander

    Checked with the hardware team, and "batches" can contain more than one triangle that needs testing. For your example with two triangles a single batch likely contains both triangles.

    Because batch size is variable there isn't a consistent relationship between batch size and the other counters. $MaliRayTracingCyclesTriangleTesterActive should be closer to what you want, but will include stall cycles that the Hit/Miss counters do not. 

  • 0 in reply to Peter Harris

    So we can't compare $MaliRayTracingTriangleBatches with other items, because this attribute is an independent calculation rule, and a count of this attribute may actually involve intersections with multiple triangles? Is this principle easy to explain?

    In addition, the $MaliRayTracingCyclesTriangleTesterActive attribute you mentioned, I don't see it in the configuration options, this should be the number of counters, right? But I want to know the number of intersections of triangles and boxes, can you convert them from this attribute?

  • +1 Arm Employee Badge in reply to greenhander
    greenhander said:
    So we can't compare $MaliRayTracingTriangleBatches with other items,

    Correct.

    greenhander said:
    the $MaliRayTracingCyclesTriangleTesterActive attribute you mentioned, I don't see it in the configuration options

    Should be called "Ray tracing triangle tester issue cycles". There is a similar counter for the box testers.

    greenhander said:
    ut I want to know the number of intersections of triangles and boxes, can you convert them from this attribute?

    Total number of triangle intersections should be the sum of $MaliRayTracingIntersectionsNonOpaqueTriangleHits, $MaliRayTracingIntersectionsOpaqueTriangleHits, $MaliRayTracingIntersectionsRayMisses.

    Can't see a way to get total number of ray-box intersections from from the counters.