sadhoney Posted December 19, 2019 Share Posted December 19, 2019 Hello - I'm generating circle splines and growing them up. But I'm stuck on how to fade color to transparent. I have an xpMaterial on xpGenerator but playing with transparency over time doesn't give me what I want. And if I move the xpMaterial onto the emitter the entire circle volume is rendered instead of just the spline. thks for help if you can! RandPuddleSplashesParticles.c4d Link to comment
teknow Posted December 19, 2019 Share Posted December 19, 2019 Do you have Cycles 4D? Link to comment
sadhoney Posted December 20, 2019 Author Share Posted December 20, 2019 No, I don't have Cycles, just use physical Link to comment
teknow Posted December 20, 2019 Share Posted December 20, 2019 This and all materials, especially complex ones are a piece of cake in Cycles. Is this what you are trying to achieve? RandPuddleSplashesParticles.c4d Link to comment
sadhoney Posted December 20, 2019 Author Share Posted December 20, 2019 Not exactly - I see you keyframed transparency in the material, which changes transparency of all the particles the same way. ie. at any given time the transparency of all particles is exactly the same. I guess what I really want is that transparency to fade in relation to how old each particle is, so at any given time the particle transparencies will be different depending upon how old they are. Thanks for your help on this. Link to comment
teknow Posted December 20, 2019 Share Posted December 20, 2019 You can use my material with an xpColor modifier. Link to comment
sadhoney Posted December 20, 2019 Author Share Posted December 20, 2019 I'll try xpColor modifier. I also solved this way: Use an xpSprite disk with huge inner radius so it looks like a circle spline. Put a regular material on it. Then, in the Transparency channel use xpSpriteShader and attach the xpEmitter to it - then just need to select Mode = 'Parameter Dependent' and choose paramater = particle life and use B/W gradient. Link to comment
teknow Posted December 20, 2019 Share Posted December 20, 2019 Very clever! Can you post the file? Link to comment
sadhoney Posted December 21, 2019 Author Share Posted December 21, 2019 Here's the way I did it - if you increase particle lifetime you can see the transparency effect a lil better RandPuddleSplashesParticles_xpSprite.c4d Link to comment
teknow Posted December 21, 2019 Share Posted December 21, 2019 Way to go! They fade out instead of popping at death. You taught me some new tricks. Thanks It is frustrating to me that the Insydium site is such a ghost town lately and there is no great place to share files and knowledge. It is really fun to share tricks and problem files. There was a real guru there named Lothar but he has disappeared as of late. I learned a ton from him and have a great collection of his example files. Over the years C4D Cafe has been the main source of my learning about C4D. Link to comment
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