Outlining Mesh? [SOLVED]

Ravi08 · Post by **Ravi08** » Sat Jul 03, 2010 4:58 pm

Hi, was wondering if someone could point me in the correct direction of how to create a line on the egde of the mesh.

I have tried searching the forum with no luck.

Thanks for your time.

Virion · Post by **Virion** » Sat Jul 03, 2010 5:06 pm

i never try this but it probably will work.
use 2 same mesh nodes and parent the second to the first. set the second node's material flag to EMF_WIREFRAME.

Ravi08 · Post by **Ravi08** » Sat Jul 03, 2010 5:37 pm

Thanks Virion, i like your thinking. It works ok but what i really want is a red line going around the edge of my mesh.

Virion · Post by **Virion** » Sat Jul 03, 2010 5:45 pm

ohh sorry for misunderstood your question. you mean something like this?

I think you'll need shader for that.

Ravi08 · Post by **Ravi08** » Sat Jul 03, 2010 5:50 pm

oh right, i was kinda hoping i didnt need to use a shader as my project is small.

Could u recommend a toon shader?

greenya · Post by **greenya** » Sat Jul 03, 2010 8:11 pm

I don't know how to do the outline, but i just want to show the sample of what i guess you are talking about -- http://www.jowood.com/games/silentstorm ... torm_1.jpg (green line -- is an outline).

PI · Post by PI » Sat Jul 03, 2010 8:20 pm

If you only want an outline like the one on greenya's image, you can just render an other mesh scaled a little bit, flip its triangles and set a color to it without lighting.

Ravi08 · Post by **Ravi08** » Sat Jul 03, 2010 8:22 pm

Hi, greenya. Yea thats a perfect image to illustrate what im tryin to do

Ravi08 · Post by **Ravi08** » Sat Jul 03, 2010 8:24 pm

Hi, PI. How would i set the colour?

Virion · Post by **Virion** » Sat Jul 03, 2010 8:25 pm

PI wrote:If you only want an outline like the one on greenya's image, you can just render an other mesh scaled a little bit, flip its triangles and set a color to it without lighting.

good idea

Kalango · Post by **Kalango** » Sat Jul 03, 2010 8:27 pm

You can do this on your modelling program, you duplicate your models faces, invert them and scale(extrude) them using local normals. This is how outline used in games likeX-Men Legends are made. If you want to do this directly in Irrlicht, it will require some math knolege to execute the extrusion or the use of shaders.
PS: Doing that x-men legends thing you cant use alpha blending or alpha masks, because they will get glitched, you can notice that x-men legends characters dont use alpha masking.

Virion · Post by **Virion** » Sat Jul 03, 2010 8:27 pm

Ravi08 wrote:Hi, PI. How would i set the colour?

set the emit color

PI · Post by PI » Sat Jul 03, 2010 8:47 pm

@Virion: Oh, come on, it's a very, very old idea... Maybe that's why I know it?!?!

@Kalango: And again: Oh, come on, he can do it in Irrlicht (without math knowledge or extruding), no need to use a modeling app and save it into an other file...!

@Ravi08: Every mesh scenenode has a material, grab it and overwrite its ambient color!

Cheers

Ravi08 · Post by **Ravi08** » Sat Jul 03, 2010 8:53 pm

@Pi: To be honest i was thinking about doing something similar to what Kalango said.

Anyway thank you all for your help, when i do this tommorrow ill post which method worked for me.

Thanks again

polylux · Post by **polylux** » Sat Jul 03, 2010 11:11 pm

Virion wrote:i never try this but it probably will work.
use 2 same mesh nodes and parent the second to the first. set the second node's material flag to EMF_WIREFRAME.

Sounds like z-fighting madness to me