Setting camera transform ?

[Nicholas Yue]

Hi,

  I am trying to set the transformation matrix of a OCamera but not sure what I should be calling to set the matrix. I dump out an existing alembic camera exported from Houdini and I can see the values I put in in some property call .xform

  When I query my simple camera, I only have one property call .geom

  Do I set transform via creating properties or is there some higher level call where I can pass in a M44d matrix ?

==============

Example dump from a Houdini exported Alembic camera.

/:

AbcGeom_Xform_v3                   cam1 {

                                    schema=AbcGeom_Xform_v3

                                    schemaObjTitle=AbcGeom_Xform_v3:.xform

                                   }

ScalarProperty      uint32_t       1.samples[1]

1

/cam1:

AbcGeom_Camera_v1                  cameraProperties {

                                    schema=AbcGeom_Camera_v1

                                    schemaObjTitle=AbcGeom_Camera_v1:.geom

                                   }

CompoundProperty                   .xform {schema=AbcGeom_Xform_v3}

ScalarProperty      int8_t         visible[1]

-1

/cam1/.xform:

ScalarProperty      bool_t         .inherits[1]

1

ScalarProperty      uint8_t        .ops[1]

48

ScalarProperty      float64_t[16]  .vals[1]

0.707107, 0, -0.707107, 0, -0.353553, 0.866025, -0.353553, 0, 0.612372, 0.5, 0.612372, 0, 3, 2, 4, 1

ScalarProperty      bool_t         isNotConstantIdentity[1]

1

/cam1/cameraProperties:

CompoundProperty                   .geom {schema=AbcGeom_Camera_v1}

/cam1/cameraProperties/.geom:

ScalarProperty      float64_t[16]  .core[1]

50, 4.14214, 0, 2.32995, 0, 1, 0, 0, 0, 0, 5.6, 5, 0, 0.0208333, 0.122916, 4554.3

CompoundProperty                   .userProperties

ScalarProperty      string         .filmBackOps[1]

swinsize

ScalarProperty      float64_t[2]   .filmBackChannels[1]

1, 1

/cam1/cameraProperties/.userProperties:

ScalarProperty      float32_t      resx[1]

1280

ScalarProperty      float32_t      resy[1]

720

Cheers

[Lucas Miller]

Put the xform in a separate OObject as many DCCs can't handle the 3d xform and the camera together.

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[Nicholas Yue]

Thanks Lucas. I got it working.

To view this discussion on the web visit https://groups.google.com/d/msgid/alembic-discussion/CAMoRnt5_mit3seYiaEwWpoDdPGQw%3DLz8ogfqiB4p3a-TPm6qxA%40mail.gmail.com.

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Nicholas Yue
Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5
Custom Dev - C++ porting, OSX, Linux, Windows
http://au.linkedin.com/in/nicholasyue
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