[Bf-cycles] Any sample on creating basic materials from scratch?

[F Escobar]

I didn't manage to make this working yet

* UVs are per face corner by default, verify that you are doing that or switch to ATTR_ELEMENT_VERTEX.
I'm creating it per face, probably in the future I'll move to ATTR_ELEMENT_VERTEX but it is easier to keep in the simplified method for now.

* Adding some random value like 0.12345 to all UV coordinates to see if they are having an effect at all.
Unfortunatly I had no luck with this.

* Create just an UVMapNode and output that directly, to see if the UV coordinates are getting loaded.
ccl::UVMapNode *uvnode = new ccl::UVMapNode();
uvnode->attribute = ccl::ustring("UVMap");
graph->add(uvnode);
graph->connect(uvnode->output("UV"), bsdf->input("Color"));

I tried that but it is always black (I assume that it means 0 0 ), notice that if I connect a texture to bsdf->input("Color") it is rendered in a plain color (uvs are wrong) but the color is given by the texture so the shader looks ok.



The mesh was created like this:

ccl::Attribute *attr_uv = mesh->attributes.add(ccl::ATTR_STD_UV, ccl::ustring("UVMap"));
ccl::float3 *attr_data_uv = attr_uv->data_float3();
for (int f = 0; f < facecount; f++)
{
for (int i = 0; i < 3; i++) //al faces are tris
{
attr_data_uv[uv*3 + i].x = 1.0;
attr_data_uv[uv*3 + i].y = float(f) / 20.0f;
attr_data_uv[uv*3 + i].z = 0.0;
}
uv++;
}

I'm not sure if I missed any step.

Thank you in advance
________________________________
De: brechtvanlommel at gmail.com <brechtvanlommel at gmail.com> en nombre de Brecht Van Lommel <brechtvanlommel at pandora.be>
Enviado: martes, 13 de febrero de 2018 15:05
Para: F Escobar
Cc: Discussion list to assist Cycles render engine developers
Asunto: Re: [Bf-cycles] Any sample on creating basic materials from scratch?

The checker texture will not use UV coordinates by default, you'd need to link in a UVMapNode node for that. For the image texture node it should work though.

It's not clear to me what is wrong. A few things you could try:
* UVs are per face corner by default, verify that you are doing that or switch to ATTR_ELEMENT_VERTEX.
* Adding some random value like 0.12345 to all UV coordinates to see if they are having an effect at all.
* Create just an UVMapNode and output that directly, to see if the UV coordinates are getting loaded.


On Tue, Feb 13, 2018 at 2:25 PM, F Escobar <materialesescobar at hotmail.es<mailto:materialesescobar at hotmail.es>> wrote:
Thank you it worked like a charm!

I'm driving nuts with other issue now

I've created my UVs with

ccl::Attribute *attr_uv = mesh->attributes.add(ccl::ATTR_STD_UV, ccl::ustring("UV"));
ccl::float3 *attr_data_uv = attr_uv->data_float3();

Filled attr_data_uv and so, but I cannot see the checker only one plain color, same issue if I use a ImageTextureNode even if I set Tex->projection = ccl::NodeImageProjection::NODE_IMAGE_PROJ_BOX;

Any tip on this?
________________________________
De: Bf-cycles <bf-cycles-bounces at blender.org<mailto:bf-cycles-bounces at blender.org>> en nombre de Brecht Van Lommel <brechtvanlommel at pandora.be<mailto:brechtvanlommel at pandora.be>>
Enviado: jueves, 8 de febrero de 2018 15:34
Para: Discussion list to assist Cycles render engine developers
Asunto: Re: [Bf-cycles] Any sample on creating basic materials from scratch?

Hi,

We don't have any example code for this specifically. It's easiest to create node with the corresponding class directly.

CheckerTextureNode *checker = new CheckerTextureNode();
checker->color1 = make_float3(1.0f, 0.0f, 0.0f);
checker->color2 = make_float3(0.0f, 0.0f, 1.0f);
checker->scale = 1.0f;
graph->add(checker);
shader->set_graph(graph);

If you want to use the generic API, don't create your own SocketType, look it up in the node.

const SocketType *color1 = snode->find_input(ustring("color1"));
snode->set(*color1, make_float3(1.0f, 0.0f, 0.0f));

Regards,
Brecht.


On Thu, Feb 8, 2018 at 2:13 PM, F Escobar <materialesescobar at hotmail.es<mailto:materialesescobar at hotmail.es>> wrote:
I tried with this:



ccl::Shader *shader = new ccl::Shader();

if (scene != NULL)
scene->shaders.push_back(shader);

shader->name=ccl::ustring(material->mName);
ccl::ShaderGraph *graph = new ccl::ShaderGraph();

const ccl::NodeType *node_type = ccl::NodeType::find(ccl::ustring("checker_texture"));
if (!node_type) {
fprintf(stderr, "Unknown shader node \n");
}
else if (node_type->type != ccl::NodeType::SHADER) {
fprintf(stderr, "Node type \"%s\" is not a shader node.\n", node_type->name.c_str());
}

ccl::ShaderNode* snode = (ccl::ShaderNode*)node_type->create(node_type);

ccl::SocketType color1;
color1.type = ccl::SocketType::COLOR;
color1.name<http://color1.name> = ccl::ustring("color1");
snode->set(color1, ccl::make_float3(1.0f, 0.0f, 0.0f));

ccl::SocketType color2;
color2.type = ccl::SocketType::COLOR;
color2.name<http://color2.name> = ccl::ustring("color2");
snode->set(color2, ccl::make_float3(0.0f, 0.0f, 1.0f));

ccl::SocketType scale;
scale.type = ccl::SocketType::FLOAT;
scale.name<http://scale.name> = ccl::ustring("scale");
snode->set(scale, 1.0f);

graph->add(snode);
shader->set_graph(graph);


But I had crashes creating color2 probably I'm doing it wrongly, is there any sample on this?


Thank you in advance.

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