Messages

76

[C4D] General Discussion / Re: Grass scattering

« on: 2015-05-25, 12:32:15 »

I've tried rendering without the texture on the blades - I'm afraid preparing time stays the same as before.
I'm attaching the whole scene.

cheers
m

77

[C4D] General Discussion / Re: Grass scattering

« on: 2015-05-25, 10:40:12 »

I've checked. CPU usage is around 10-15%. Ram around 8Gb. Which is comparable to vray readings when rendering(precompiling) the same scene.

78

[C4D] General Discussion / Grass scattering

« on: 2015-05-24, 17:35:19 »

Hi to all!

I'm starting to test recently published Corona alpha2 for Cinema. I must say I'm really impressed!
Today I was playing around with grass scattering (with surface Spread) and I have a question for anybody that has some experience with it.
It's precompiling really fast when I keep number of render instances low (p.e. when I cover a filed aprox 20meters from camera) but when I try covering aprox 40meters the "Preparing" part goes on and on. I'm asking this because a friend that uses Max + Corona does not seem to experience the same long "Preparing" pre-rendering time. I'm wondering if anybody could light the subject a bit.

I'm attaching a preview image - it only took 2min to render this, which is pretty fast (I'm covering aprox 20m radius around the camera - actually only the cone area). But increasing the size just increases the time really drastically (to about 20min of Preparing time).
Is there anything I can do to speed it up?

The grass patch has 800 polys, it's not that heavy.

I'm using i7 3930K, 32gb ram

cheers,
matej

79

[C4D] General Discussion / Re: HDR Lighting

« on: 2014-10-04, 13:44:58 »

I agree on everything you've sad mp5gosu.
I use HQ PG HDRI images but there is still a need to make small adjustments in gama (somwehere in between 0.75 - 1) in order to get exactlly the right sharpness you want. Even if you use sunny-day HDRI. Offcourse there are alternatives (using sun or direct light) but they are a bit time consuming, but certainly doable.
I don't want to impose my method as the right one, I'm just saying there are HQ 3D artists that use this method and this is why I would love to recreate it in Corona too. I'm a vRay user ATM.
Here's his blog post about the issue: http://bertrand-benoit.com/blog/2010/02/27/on-hdr-lighting/
You could find Peter Gutrhrie's post on his blog too.

cheers
m

80

[C4D] General Discussion / Re: HDR Lighting

« on: 2014-10-04, 09:30:58 »

@mp5gosu: peter guthrie and berntrand are changing gamma (or is it gain?) for quite some time now, based on their blog reports. So i the rest of the community. So I don't see anything wrong with it, results are great and so is the workflow (no need of positioning the sun to fir the HDR). But I wouldn't change anything besides gamma(gain) though!

@tomislavn: in does work in luminance channel in 1.1 if I'm not mistaken. Will try it out later.

cheers to both!
matej

81

[C4D] General Discussion / Re: HDR Lighting

« on: 2014-10-03, 23:29:56 »

Are you sure?
I have a simple interior scene and there is no change when I rotate it....hmm.

Another thing: in vRay you would adjust gamma if you'd like sharper shadows when using HDRi. Do you use c4d "Filter" in order to adjust the gamma or do you get sharper shadows in another way? Actually there seems to be a setting in Luminance channel in Corona material .. .but I'm not sure if I should use Luminance channel at all, as some of you suggest ?

thanks
matej

82

[C4D] General Discussion / Re: HDR Lighting

« on: 2014-10-03, 17:50:26 »

Hi guys,

any experience with adjusting rotation of HDR map on sky object? I've tried rotating the whole sky object + rotating only the texture, neither works. Shadows stay orientated in the same directions no matter what I do.

thanks
matej