All entries for Monday 12 June 2006

June 12, 2006

Rain and hail…progress??

The hail storm was awesome.. big chunks of ice falling from the sky on a SUMMER afternoon. Hmmm how bizarre! But I love suprises.. so it made an awfully dull afternoon magical for a few minutes. The rain storm that came prior to the hail extravaganza reminded me of torrential rain in Malaysia. How very calming and soothing, I must say!

Spent a few hours experimenting on my deformable models.

What I did:

i. Manage to fix the problem with the index values for indexedTriangleSet
ii. Rendered the H3D X3D model of heart
iii. Rendered the inner surface of a heart on the hapticViewer example provided by openHaptics api

Findings:

i. 'Haptic holes' and irregularities still exist on the indexedTriangleSet mesh. The probe kept on penetrating the surface which was utterly annoying!!!
ii. The collision method for the probe is based on point collision which I suspect to be the culprit of unrealistic probe penetration

Conclusion:

i. openHaptics method is more stable when it comes to the mesh interaction
ii. will need to study the deformation methods based on:

  • deformable surface example from the openHaptics api
  • chainmail method from Thomas Earnest (H3D)
  • soft tissue demo report
  • other methods as described by the published materials

iii. Aim: By end of June – complete the deformable heart model with haptic spring mass (the least!!)
iv. will work on multiple surfaces or volumes in July together with anatomy and database

In Jesus' name, I pray that I'm moving towards the right direction and I will get major breakthroughs along the way. Amen!!!!


June 2006

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