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Found 4 results

  1. Hi all, I need to use OpenGL cards for a project, and I'm noticing an issue with transparency. In the pictures below I have a transparent tif. From head on, the alpha works perfectly and I can see everything behind the texture. The more I look at it from the side, the transparency goes away until it is basically opaque. I noticed in the OpenGL docs http://www.sidefx.com/docs/houdini/props/material.html#ogl that there are separate tags for alpha and alpha parallel. I can't find any way to apply the image alpha to the parallel alpha though. It works fine if I turn off use lighting, but I actually need to light my cards for this one. Any help is much appreciated! Thanks for taking the time to read. Dylan
  2. Advice needed for pyro sim

    Hi Guys, I am currently working on a shot where I need to simulate an object falling slowly through deep water whilst bleeding (The more blood the better). Initially I began with a pretty simple setup, An emissive object, a collision object and a divergence volume which is being used for expansion. The problem I am running into is that I need the smoke to continually expand, whilst becoming more diffused and transparent, but to always remain in the sim. So I have disabled dissipation as I don't want to lose density, but this leaves me with a dense volume which isn't transparent or diffused. I would like the density that is in the sim to have an aged based blurring. I did try to achieve this with a gas dissipate and heat field but this still wasn't right. I have also spent time trying to tweak the pyro shader to achieve the desired effect but I am not having much luck. Below is an example of the look I am trying to achieve. Between 0:21 and 0:34 Any advice will be greatly appreciated. Many thanks, Clive Blood_in_water_odforce.hip
  3. Candle flame transparency

    Hi guys, I made a candle flame with the pyro2 shader. The problem with the shading is that i don't get the same transparency as in the reference. In the reference, the blue/transparent part is the hottest. I mapped the temperature to nothing where it is high. The interior where the wick is, is transparent. The problem is that there is this outer shell/outline of lower temperature which has some density and give the are some opaqueness. How would you do it? I could do an alternate setup with geometry revolved around a simulated curve and control the shading via color and transparency ramps. Had to zip the .hip so that odforce would upload it. Cheers, Johannes candle_flame_b_0009_jf.zip
  4. Transparency trouble

    Hey guys, im have an other rendering problem when it comes to my pyro sim. So i am testing the render settings and ive noticed that for some reason it is black when i feel like it should look transparent. Ive included some pictures to explain a little of what i mean. In the 2nd picture it has the look i was expecting it to have if it were truly transparent but in the first picture you can see that it isnt. At first i thought maybe it was the lighting but then i added an environment light and it still is doing it. So please any help would be appreciated!
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