Implement picking functionality #4657
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reviewers: it's almost ready, missing only the java API I think and maybe a sample. |
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Should we add picking to matc's |
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android/filament-android/src/main/java/com/google/android/filament/View.java
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This is just a minimal change to get the R_INTEGER format to work. - if src/dst types are identical, just copy (this avoids a mul and a div) - add R,RG and INTEGER types
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This is a pixel accurate implementation of picking. Picking queries can be created on view, and upon completion a user provided callback is called with the Entity of the renderable at the queried coordinates in the viewport. Picking queries typically have 1 or 2 frame of latency and may impact performance on some drivers. It is mostly intended for use by editors, or when latency is not a major concern. This api should not be used for dragging/moving objects, it is intended for initial picking only. Picking is implemented in the structure pass. The depth buffer value is retrieved and the fragment coordinate is reconstructed and passed to PickingQueryResult. This can be used in turn to calculate the view and/or world space position.
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Thank you for providing this handy API for us and it can make our lives easier. I have one question for you: If one picking query is requested and multiple entity is selected, how would the PickingQueryResult return these multiple entities? |
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It won't, it will return the closest Entity. |
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How to support pick moving/dragging objects? |
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Is there any way to get picked material or primitive? Or idea what should be done to make it possible? |
The pick result callback has returned nearest entity. You can use renderableManager.getMaterialInstance to get selected material . |
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This is a pixel accurate implementation of picking. Picking queries
can be created on view, and upon completion a user provided callback
is called with the Entity of the renderable at the queried coordinates
in the viewport.
Picking queries typically have 1 or 2 frame of latency and may impact
performance on some drivers.
It is mostly intended for use by editors, or when latency is not a major
concern. This api should not be used for dragging/moving objects, it is
intended for initial picking only.
Picking is implemented in the structure pass.