PolySplit syntax looks like this:Since we used Convert Line to turn each line segment into its own primitive, we know we’re always dealing with edge 0 for each segment. ... Intersection Analysis. Can you please explain how you achieve to get te map that didn't touch the river geometery back in place ? We’re often working with cutting-edge technology which has to be tamed first. Just expose the Houdini-“Render”-Button as Parameter. This will help me later to blend different water-textures and place particle systems.Let’s go a little bit faster over the river-geometry-creation since all of that is perfectly fine explained in Ben’s video. Instead, you use the underlying surface-normal and the normal of the point to calculate a local axis for each point (which points away from the spline and down the hill). I have a similar problem, I have two sets of plines, i need to find the intersection of them and then,find the closest point of them to a given point, but when I use the line/line intersection it doesn't give all the intersection points, I can't figure out the problem. There was an interesting thread recently on Odforce in which someone wanted to be able to “boolean” a curve against a polygonal mesh; essentially chopping up the curve at the intersection points between the curve and the mesh, and removing the inside parts of the curve. Hi Manuel. The most important point is, that only the Again, it’s 100% Ben’s workflow but it starts by moving the terrain Then, for every point in the terrain, you shoot a ray upward. This is done by reading the height of the terrain at the spline-point-positions and then moving the points to this height:Next, you let the spline-points “roll” down the hill to integrate the river a bit better to the terrain:Actually, they do not roll in a physical way. A switch sop uses this result to switch between either the current building, or a null.
First, you create a spline and let it “fall down” on the terrain. opinputpath(“.”, 0) is an easy way to point to whatever node is connected to the first input of the node the expression exists on. Besides, since the game dev tools are brand-new, sometimes you will find bugs, anomalies in the documentation or you’ll struggle to get the output as you want it to be.But that’s a common situation for game developers, isn’t it? I got into Houdini a couple of days ago and been learning a lot in here and also in the Patreon page. Next, we use the very cool Intersection Analysis SOP to get the points of intersection between the curve and the mesh. For a fast and fluid experience, the new network editor has been redesigned from scratch to include custom node shapes, alignment and layout tools, ‘dot’ nodes and much more. It’s easy if Further improvements would for example be: avoid placing obstacle-particles “behind” objects (away from river flow direction), setting the orientation of the obstacle-particles along the flow-map so that particles move into the direction of the flow, accept Unreal-Terrain as Input, improve performance of the node-network so that changes on the spline get calculated faster, narrowing/extending the river-width depending on the area (like in Ben’s video).Houdini has a steep learning curve. Now that our primitives are slightly biased inwards, we can easily tell what points are inside the cutting mesh by using a Group SOP in Bounding Object mode. We define a “bias” parameter that we can fine-tune later (hit the plug button in the top corner of the wrangle node if you don’t see it). To do that, I shoot some rays from every terrain-polygon upward and if I hit the river, I assign a color to all And here is an example of how much difference it makes when using the mask in a material to assign different diffuse and roughness values:Generating the flow-map for the river is super easy with Houdini. Here you see me changing the spline and in the Another detail: I wanted to make the river bed darker and wet. So we’ll have to use some VEX to generate that string. The so-called Houdini Engine is a plugin for Unity, Unreal, 3ds Max, Maya, and Cinema 4D and executes the node networks you create in Houdini directly in the mentioned programs. So for us to cut primitive 2, edge 0 at halfway across the primitive, our cut syntax would be The string for all the cuts can be generated in an Attribute Wrangle (detail mode) as follows:This assumes that your intersection points are in input 1, and the line to cut in input 0. Composites vertex, point, primitive, and/or detail attributes between two or more selections.
Then I spice it up with a little noise and the mask is good to go:To make the foam-mask less static, I use a simple Photoshop cloud pattern which I move along the river and subtract it from the original mask. All the previous buildings and the current building are fed to a intersection analysis sop. The Point Wrangle code looks like this:Not too bad. You just tell a special node “This is my river geometry and this is the spline which indicates the river-direction” and boom, your river geometry suddenly has vertex colors assigned representing the flow of the river:Another node can be added which makes the flow-map react to obstacles. Luckily this is very easy in Houdini. This can be imported and used like any other asset in Unreal: This ended up being a little trickier than it sounds. This value can be used to scale the UVs. Houdini 17.5 introduced the concept of “packages”, which are little JSON filesI continually run into confusion from Houdini users about how the Houdini.env is supposed to work, what the syntax is supposed to be, or even what it does in the first place. First, you create your UVs in the 0-1-UV-Space and then you measure the spline-length. By using the site you agree to our use of cookies. Mar 11, 2018 - Explore Dorin Croitoru's board "houdini" on Pinterest. 翼狐网致力于推动CG艺术发展,为用户提供海量的CG视频教程,本节内容主要介绍特效师的必修课《Houdini学习之路》零基础入门【宝典式】之课时53：SOP节点第46讲. Of course there’s always an easier solution out there, but I stumbled onto a reasonably stable solution that seems to work for both very simple and very complex curve intersections, and it’s only a The first step to making all this work is to convert the polyline into primitives; one for each line segment. It stores basically the distance to an object into the vertex color of the river.