Blast
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Blast
Blast removes geometry that you select iteratively in the viewport. Unlike the Delete sop, blast is more lightweight and intended for non-procedural deletions.
To make the most of the blast SOP, you'll want to understand how to utilize group expressions. For information on this visit: https://www.sidefx.com/docs/houdini/model/groups.html
It's also wise to specify the Group Type whenever you use this node. I've found that the blast sometimes fails to work unless you specify exactly what kind of geometry components you'd like to remove.
Main Parameters:
Group Type:
* Breakpoints:
-- This relates to NURBS breakpoints. For more information about NURBS and breakpoints, visit this video:
https://www.youtube.com/watch?v=iv51A4syohU&ab_channel=hipflask
* Edges:
-- Deletes points based on which edge they belong to. Keep in mind that "edges" are not considered to be a geometry component in Houdini because they are not responsible for the generation of a primitive. Here, we are using edges to ultimately affect points which then get deleted.
* Points:
-- Deletes points
* Primitives:
-- Deletes primitives
Recompute Normals:
-- The removal of geometry can change the effective normals on the surface. This option will recompute any point normals to ensure they reflect the result of the deletion. This is especially noticeable towards the edges of where you deleted primitives. Because point normals rely on surrounding faces for their orientation, it's important to recalculate them if they're next to a face which just got deleted.
Keep in mind! Point normals are not the same thing as vertex normals. The blast SOP will seek to correct point normals rather than vertex normals, and if you have vertex normals, then it will convert them into point normals.
Delete Non Selected:
-- Inverse the selection
Fill Simple Holes:
-- This is useful when you want to delete points, but don't want it to cause a hole in your mesh. Be sure that the group type is set to points.
Delete Unused Groups:
-- Lets say you delete some polygons that are part of a group, and that group no longer has any polygons in it. Delete Unused Groups will delete that group which as no polygons left in it anymore.
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Aug 28th, 2024 Changelog
General Changes:
• New, simplified website design is now live!
◦ All new particle banner is featured on the home and after login pages
◦ The after-login page now features courses that are sorted by ones that you have recently watched. This makes it easier to continue watching whatever you’ve been working on without scrolling through all the courses to find what you’re looking for.
◦ There is also a new “resources” section that can be found beneath the “Browse Courses” on the after-login page. This makes it easier to bring up the Node Bible, the “Tips + Tricks,” or Weekly wrangle in a new tab
◦ “CG Forge Academy” has been replaced with a “Mentorship Calls” at the top menu (see below for more details)
◦ The resources dropdown now features “Tips + Tricks” (see below for details)
◦ Certification requirements have been slightly re-written to be easier to understand
◦ Subscriptions have been re-designed from the ground up (see below for details)
Subscription Changes:
• Subscriptions have changed to include a "Basic Subscription" and a "Premium Subscription" option. The Basic Subscription renews monthly, and the “Premium Subscription” renews every 4 months. Yearly subscriptions have been removed.
◦ These changes only affect new subscribers. Existing subscribers will not see anything change with their auto-renewal amount.
◦ 10% off a Redshift yearly subscription is now included with the Premium Subscription. (If you are currently a 4 or 12 month subscriber, then just email support@cgforge.com for this)
◦ A new “Study Plan” call has been added to the Premium Subscription. (If you are currently a 4 or 12 month subscriber, then just email support@cgforge.com for this)
◦ A Houdini education license is now available for “Premium” subscribers. (If you are currently a 4 or 12 month subscriber, then just email support@cgforge.com for this)
◦ For more information, visit the subscriptions page.
• CG Forge Academy has been redesigned to be easier to use.
◦ 45 minute calls have been removed. Existing coupons are still valid and can be used towards 90 minute sessions for the amount listed on each coupon.
◦ 8 week mentorships have been removed - Instead, you can book as many 90 minute calls as you’d like.
◦ Free onboarding calls have been removed - Instead, premium subscribers now receive a complimentary “Study Plan Call” that establishes a personalized curriculum moving forward.
◦ The “CG Forge Academy” top menu is now replaced with “Mentorship Calls” and only allows for booking 90 minute calls.
All new “Tips and Tricks” resource page:
• “Tips and Tricks” is now a resource page that holds all quick tips, Houdini update videos, and other miscellaneous videos in one place. If you’re looking for “Quicktips Season One and Two” or "Houdini 19 Updates" they have now migrated over to the “Tips and Tricks” resource section.
Discord changes:
• The CG Forge Discord channel will now be divided into two categories: “Basic Members” and “Premium Members.” The premium member channel will be invite-only to premium subscribers or those who are currently enrolled in a 4 or 12 month subscription. If you eligible to join the premium discord channel, email support@cgforge.com for an invitation.
◦ Basic Discord members will no longer receive support for projects that are outside the topic of CG Forge courses.
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If you have any further questions about these changes, feel free to email support@cgforge.com
Cheers,
- Tyler