Scaling transformation issue between maya and houdini

[diegotrazzi]

There is a scaling issue when importing a .bif cache back into houdini.
I have made a simple scene to be able to replicate this.
To replicate the issue from scratch do the following:

• Create a sphere in houdini (i.e. 100 units, translated 100 y)
• Export the Sphere as alembic to Maya and convert the sphere into an emisison object and emit one frame
• Export the liquid cache and import back into houdini.

At this point you will see that the imported cache is smaller than the original sphere created in houdini.
I am attaching a screenshot and two scene files which illustrate the issue

test.zip

[bareya]

I assume that all properties that we read from bif we must be scaled 10 times, is that correct ?

[diegotrazzi]

No, Ive tried a x10 scale but didn't line up

On Tue, Jul 25, 2017 at 21:21 Piotr Barejko ***@***.***> wrote: I assume that all properties that we read from bif we must scale 10 times, is that correct ? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#6 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABMBhICZ5Hv-uNx2z5HE54Oy7e51PcsZks5sRr7ggaJpZM4OjZ1n> .

-- Sent from my iPhone

[bareya]

Can you upload bif too ?

[diegotrazzi]

adding .bif
voxel_liquid_particle.0001.zip

[bareya]

In that scene it looks like scaling up by 10 fixes the issue:

[diegotrazzi]

I will double check with my full sim scene because I have tried that yesterday but was unsuccessfull. I will update the ticked, if is only a linear 10x scale is super easy. Sorry about the trouble. Will let you know.

…

On 26 July 2017 at 11:27, Piotr Barejko ***@***.***> wrote: In that scene it looks like scaling up by 10 fixes the issue: [image: screenshot from 2017-07-26 11-25-42] <https://user-images.githubusercontent.com/953003/28637156-6c4daf1e-71f5-11e7-880b-e3b60d4589f9.png> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#6 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABMBhF7GAJpJ4gvS2N9kR0I7pWGlBLSbks5sR4UngaJpZM4OjZ1n> .

-- :-D.iego

[bareya]

No worries at all! :)

Can you upload full sim or is it too heavy ?
I wanted to check component's transformation matrix. In provided sphere bif component's matrix is an identity matrix.
I wonder how that matrix can be altered in Bifrost? By moving object in Bifrost ? Can you do that ?

In my code I don't do anything with component's matrix, for sure it's something what we should take into an account.