Join Veejay Gahir for an in-depth discussion in this video Intersecting planes and surfaces, part of Alias Essential Training.
- In this video we're gonna take a look at how to intersect surfaces and surfaces and planes to create a curve on surface. Now we've already touched on this when we were doing the 3D trim command, but I wanna look at it in this particular scenario. So let's go to surface edit, create a curve on surface using intersect. Let's take a look at some of the options here. Now we're gonna make sure that we've got creating a curve on surface on both surfaces and let's keep on history. Let's say go with that and we're gonna select this first surface here.
You'll notice the bottom we have the option to accept this, I'm gonna space bar to accept and now I'm gonna pick this surface at the back and then also this sphere. So those green lines represent our curve on surface so if I go ahead and just switch off the grid and in this case let's select all this data and let's just switch off the U's and V's for a second and there's our intersected curves on surfaces. All right let's shade this up and we're gonna do some trimming now. So let's go to surface edit, trim, trim surface.
Let's do a reset on that and we're just gonna go ahead, pick this surface here, select this portion. We're gonna go underneath the sphere. We're gonna pick this surface, select this portion here and on the back we're gonna have an issue because the blue surface doesn't extend to the very edge of the green surface. So let's go ahead. We're gonna pick this and we see that we have these errors occurring at the end here. We have a red dot indicating that there's a potential problem. If I space bar it's not gonna do anything.
So let's go ahead and do extend and let's push this right to the very end. Click again and you'll notice it fails. So let's go and interrogate this and let's see what sort of distance we have. So under locators we're gonna go measure distance. Again, just use the default of true. Let's say go to that. Now just be a little bit careful of where you pick this time because if I pick this edge you'll notice I have two entities. Now I can pick either one of those and if I pick this one for example it locks my locator in there and my next one is gonna be roughly in this position.
I'm only gonna eyeball this in. Now I've got to go through the work of moving this locator to here. So we're looking at approximately 10.7 millimeters, so it was above 10. So I'm gonna delete this locator with L. Let's go back to locators measure distance and if I use this edge here, this edge has not been used in any operation, so it's a clean edge. So I could just simply slide to the end and do that. Again, it's not a big deal. It just saves one step of having to move that locator.
So again, we're over 10 millimeters, so let's just delete that locator. Let's go back to our surface edit, trim, trim surface, extend, and let's just put in 11 here. Select that surface. Pick that surface there. It's gonna tell me we're gonna lose history and that's fine. We'll accept that. By the way, if it failed again that would have told me that this edge down here was greater than 11 millimeters. So let's go back to surface edit, create curves on surface intersect.
Again, we're gonna use the same options and I'm just gonna window over all these entities. Space bar to accept and pick this plane this time. Now let's go ahead, shade. Actually I'm gonna use a regular multicolored shade here and let's go to surface edit trim, trim surface. Let's pick this back portion here. We're gonna pick this back portion here and at this point here I'm gonna pick the back of the sphere now. We have to be careful here. Because this sphere was a periodic entity the start and end of the sphere is right where my cursor is and I can tell that because that's the darker line here rather than these (mumbling) on either side of it.
So let's go ahead, surface edit trim. I wanna pick the surface and I wanna pick right here, but you'll notice as I'm picking I'm not seeing an indicator. Now this is a slight bug in Alias and it's not a big deal. What we have to do is we're gonna just window over a portion like that and then just move the cursor over like that. Again, for this one just move it over and select the area that we want. Now this could be just typical of trying to trim a periodic entity like we have here, but again there is a work around. Now if we select this plane you'll notice nothing lights up pink, but there is associativity.
So if I say move the left mouse button and move this plane, you can see that it actually does update.
- Manipulating views and entities
- Working with layers
- Creating curves
- Sweeping, extruding, revolving, offsetting, and blending surfaces
- Modifying geometry
- Moving, scaling, flipping, and rotating objects
- Trimming curves and surfaces
- Creating copies of objects
- Aligning, combining, and splitting objects
- Analyzing geometry
- Shading models