I need to assign black color to some objects when rendering V-Ray RenderID pass in 3Ds max. And I don’t know if it is possible to do this, because by default 3Ds max distributes colors according to the IDs of the objects in the scene.
Tried various options, but so far to no avail.
Related
How is it that the texture for a beat is applied different objects in this moonrider project. First, I see that a beat material is defined using this.beatsTexture:
https://github.com/supermedium/moonrider/blob/b24431261dca9c8f5df717a5518983f69eeb58e4/src/components/materials.js#L241
... and when I go to the texture, I see a single texture being generated for all of the various colors.
https://github.com/supermedium/moonrider/blob/b24431261dca9c8f5df717a5518983f69eeb58e4/src/components/materials.js#L474
What I can’t trace down is:
How is this texture being used to identify different colors with the different beats (e.g. red vs blue)?
How can view the results of this texture easily to be able to debug?
Where is the logic where this texture’s coords are translated for the different beats to show the correct colors?
Thank you for the help!!!
To try to help with #1:
In the first file you linked, after the texture is define, a few materials are also defined which use that texture. Each of the materials specifies a different color (scheme.primary and scheme.secondary) which can be used to tint the texture being applied to the object. When an object collides with the mesh that uses the material, one could determine the color by checking something like mesh.material.uniforms.color.value and seeing if it were equal to the primary or secondary color, for example.
I mean not bounding box and bounding sphere, but exactly pixel perfect, I mean.
Maybe shader or special renderer? Give different colors to different meshes, and by rendered colors detect what objects were selected?
After three days of googling, I haven't found a single answer on the Internet. Help, please.
For example, this Box should not be selected:
How does Blender do it? If I select many objects, he clearly understands what I have selected. Do you have any ideas about their algorithm?
Maybe we can paint objects in the scene in different colors, and render the scene, and then use the pixel colors to understand what colors are visible? And so we exploit the parallel nature of the graphics card? Its like raycasting, but by every selection pixel.
There is now a feature request at GitHub: github.com/mrdoob/three.js/issues/20530
I have many textured meshes so they must have different materials. It seems like there are only two ways to clip: globally, and per-material.
However, I want some visualizers to not be clipped (e.g. the plane I'm manipulating to define the clip planes), but all of the rest of the meshes are to be clipped. So I want to use global clipping, but to exempt the parts of the 3D UI (specific objects) from clipping. Is this possible?
I'm fairly certain that I can address this at the application level by separating the scenes so that i can issue the render of items i need clipped by using globally clipped functionality, and then clear out the clip planes and render a second scene containing UI elements prior to clearing the renderbuffers.
I have a photo-realistic scene already created in 3ds max. I want to render the scene on the web using WebGl and three.js. TO get the realistic effects created in 3ds max using mental ray renderer, I tried to bake the light maps from 3ds max to JPEG files and then map objects in three.js to the texture(exported JPEG) files. But the efeects in three.js seem to be stretched out and not positioned properly. Is my approach correct in the first place? If yes, could it be a problem with the UV mapping from the 3ds Max? Please provide some links if possible to map UVs properly in 3ds max while baking if that's the issue.
Also, do I need to use any custom shaders to get such effects? (I honestly know nothing about shaders if this question seems silly)
Thanks in advance.
I would highly recommend using the THREEjs exporter:
https://github.com/mrdoob/three.js/tree/dev/utils/exporters/max
I have had a lot of trouble with Maya and other programs using any of the built in export options. Face winding, UVs and other stuff seems pretty iffy.The exporter helps.
Once you've done that, there's something else to keep in mind - THREEjs allows two sets of UVs only per piece of geometry. One for the map, bumpmap, displacementmap, etc, and another for the lightmap. So if those two UV sets end up different from one another, you might need to swap which you assign as map and which as lightmap.
Link a fiddle with what results you have so far and we might be able to help more. The only thing i can recommend is to use the THREEjs exporter without seeing what code you're using.
Exporter for 3ds Max has been dropped from the official Three.js repos, you should use glTF format instead. See this official page for the list of glTF-compatible Max exporters:
https://github.com/KhronosGroup/glTF
I am working on a project which needs rendering of thousands of unique meshes of building models. My objects need to be selectable and they will have their data (other than geometry) attached to them.
Since number of objects/meshes has a big impact on the rendering performance, I merge my objects into a few huge meshes and create "pseudo meshes" which just hold information about the indexes of the mesh's triangles and the other data attached. I am able to render each mesh with their own color and user is able to pick them separately.
However transparency and render order is making things hard for me. I managed to render my scene with transparent and non-transparent objects by merging them to separate meshes.
My problem is not being able to highlight the picked objects effectively. I want the highlighting to be a non-transparent color. If a transparent object is picked I change the associated triangles' color attribute to match my highlight color with opacity of 1.0. But this does not work as I intend to because, since the merged mesh's material is transparent, the render order for it won't change although I set the opacity of its' triangles as 1.0. Result is poorly ordered objects on the screen.
I know I could use MultiMaterial but then number of drawcalls -may or may not- increase enormously if the user selects high number of objects. So I am looking for a better solution that will keep the same performance whatever happens.
Do you have any suggestions on how to solve this problem?