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Search the Community: Showing results for tags 'Glass'.



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Found 12 results

  1. I havent realy used Flips in houdini, so i have this realy basic problem.... So I have set up this scene from shelf tools, and it seems i cant figure out how to make a basic glass fill with fluid, it just dosnt fill up, it seems like particles are been deleted.... I have attached my test/example scene. I hope someone can explain me why its not working. Thanks in advance, Tom glass_fill_basic.hipnc
  2. Hello everyone! I am new user to this forum. I used PBR to render a simple glass object, however the corner of the object shows some pure black artifact. How can I fix it ? I changed some settings and do some experiments, I tried to increase the limit of reflection and refraction, increase the overall sampling quality, change the Allowable Paths to All Paths, but none of them fix the problem. Is it a common problem of PBR rendering or did I miss something ? Thanks in advance.
  3. Hi guys, I'm started on a H16 sim where I have a cup of ice and fluid and another piece of ice that will dive in and float back up (animated). I've almost always dealt with larger water sims and don't have much Houdini experience with small scale sims I figured some people here have experience with such simulations and would like to ask if there are any best practices and tips here? I have some questions myself 1. How important is it to try to simulate and keep everything to scale for rbd and flip sims of this sort? I have found in my initial bullet tests that just trying to fill the glass with ice at scale tends to give me exploding rbd sims. In this case, I had the ice cubes and glass modeled in maya. When I brought it into Houdini I scaled it down by 100x to match the meter scale in Houdini. I tried adjusting the collision padding to stabilize the sim but to no avail. I had no issues when I worked at 100x scale. I'm curious if anyone else has experienced this? However, not working to scale meant that my flip sims feel larger in scale, like a swimming pool and not a cup. Increasing gravity 3x has helped the sim look more to scale. But that seems very arbitrary to me. I'm more inclined to work at a bigger scale as adjusting to smaller scales have given me all kinds of problems from unstable rbd sims to leaking water particles and decreasing water levels. 2. Is flip the the recommended approach for these fluid sims? I've seen sph being recommended. But honestly, I don't even know where the sph tools are 'hidden' these days in Houdini. And I know these days SideFX recommends flip for everything. 3. What is the best way to get some of the ice to interact with the water sim? Via density and flip solver feedback or the bouyancy force dop node? 4. Any tips on dealing with collisions and keeping things water tight in a thin lip glass that still needs water to splash out of the glass? When testing, I often found that it was very easy to leak fluid from the container even though my flip collision guide shows that there isn't any holes in glass collision. 5. Any tips in meshing the fluid with regards to lighting and rendering? I've seen it recommended that the water geometry be slightly larger then the glass. How are folks doing that with flip sims? I'll try posting an example file whenever I get to a good point. I really would like to benefit from the experience of folks who have done this sort of sim. Thanks in advance.
  4. I want to make a scene that bullet pass through glasses(with fracture), fluid sims and other objects. but, when I make sphere to bullet size, It can't pass through and just bounced off. 1. How can I fix it ? 2. and wanna make it slow which node can I use for it ?? sorry for my poor English and will be pleasure if you help me Thx for read.
  5. Hello, I'm working on a small project to have a bullet fracture a glass bottle in slow motion. I have come across a few problems while doing so and could use some help.. 1) The time warp is causing some strange scaling issue on the bullet. It continuously scales up and down. 2) During the render with the glass, you can visibly see all the fractures. Only way I can think of countering this is using a switch to switch between the solid and fractured bottle. But this wouldn't be the best option because, the effect being in slow motion, the transition will be obvious. Thanks for the help! bottle_fracture_v09.hipnc
  6. Hey, guys! I am currently working on my bachelor thesis film. A scene contains a crystal hitting the ground and shattering. Unfortunately, I experienced a strong flickering in my rendered images, different from the typical sampling noise. I am not sure what causes the flickering. I assume the Bullet sim itself is the reason. The pieces intersect a little bit and never stop moving completely. The problem is more evident with a glass-like shader than say in a clay shader. I played a little bit around with the Collision Padding and the Threshold parameters, but it didn't bring the cure. I also tried some symptom treatment via freezing the pieces, when they reach a certain velocity threshold. But this wasn't a true solution because the pieces sometimes stopped in the mid-air. Maybe the problem is shader-related... In earlier stages of my work I had some problems with the normals, but in the meanwhile I fixed them. So I don't think the problem is normals-related. Does anyone have ideas how to fix this? I included a video showing the problem and the scene file. Edit: Problem Solved! flickering_002.mov crystal_001_v196.hiplc
  7. Hey everyone! I am in the RnD Process of having a bottle filled with water crash to the floor. I have set up the Bottle with Bullet and constraints. Which works fine. Also the FLIP Fluid without Bullet works fine too obviously. Now if I merge the whole stuff the first few frames mostly work well. But the moment the bottle crashes to the floor the Bullet Sim kinda gets horribly explosive. I tried different flip collision method, yet they do not pick up the very thin bottle geometry. Any ideas on how to make this work properly? Or should I just sim both things one after the other? Assuming the water would not have an massive effect on the behaviour of the Glass? Thanks so much for any help in Advance! Hipnc attached. WaterInBottle_003.hipnc
  8. Inspired by Renderman's community website, I tried to replicate the industrial and basic glass materials with Mantra. The scenes still need tweaking but I ran out of time. Would anyone be interested in a Mantra procedural materials challenge?
  9. Hi there, I'm trying to shatter glass with prefracturing via voronoi. So far so good. I know that the common use to prevent rendering the seams of the prefractured glass is switching from a non fractured to fractured geo within 2 frames. But is there another way to render the prefractured glass as a solid piece? Tried transfering Normals from the unbroken object to the prefractured object but that didn't do the trick.
  10. Hi people, im having a problem with black render peaks, i tried everything, , do you know how can i fix this? Thanks
  11. I`m ussaly not render at all, Any Tips, Hints , Ideas to help me learn how to create realistic render with mantra would be very helpful ! project file
  12. Hi! I have made a glass that shattered. See: Now i have cached it out and want to add some flipfluids such as wine. But because my glass object is to thin, its just go's true my glass. What i tried to do is to set its collide divisions to 150, but then im stuck with another problem. before the glass hits the ground, almost all fluids is disappeared. Has anyone a solution how to handle this kind of things? thnx alot!!!!