逃逸色度键颜色 [英] Escape chroma key color

问题描述

我正在尝试使用 ARCore 的 Sceneform 框架来播放基于 chromakeyVideo 示例项目的视频.

I'm trying to use the Sceneform framework from ARCore to play a video, based on the chromakeyVideo example project.

在创建模型时:

 ModelRenderable.builder()
        .setSource(this, R.raw.chroma_key_video)
        .build()
        .thenAccept(
            renderable -> {
              videoRenderable = renderable;
              renderable.getMaterial().setExternalTexture("videoTexture", texture);
              renderable.getMaterial().setFloat4("keyColor", CHROMA_KEY_COLOR);
            })
        .exceptionally(
            throwable -> {
              Toast toast =
                  Toast.makeText(this, "Unable to load video renderable", Toast.LENGTH_LONG);
              toast.setGravity(Gravity.CENTER, 0, 0);
              toast.show();
              return null;
            });

代码设置要从渲染中删除的键色(在本例中为绿色)，但我不希望从渲染中删除任何颜色.这是设置该属性的行:

The code sets the keycolor to delete from the rendering (green, in this case), but I don't want any color to be removed from my render. This is the line that sets that property:

renderable.getMaterial().setFloat4("keyColor", CHROMA_KEY_COLOR);

如果我注释该行或将颜色替换为空值，则删除的颜色为黑色.我不知道如何跳过这个过程，以及我为 setFloat4 不完整.

If I comment the line or replace the color with null, the color that is deleted is black. I don't see how to skip this process, and the documentation I found for the setFloat4 is incomplete.

有什么想法吗?

推荐答案

创建仅使用外部纹理的新自定义材质比使色度键控成为可选项可能更容易.您可以在名为 externalTexture.mat 的 sampledata/models 目录中创建一个新的 .mat 文件:

It is probably easier to create a new custom material that just uses the external texture vs. making the chromakeying optional. You can create a new .mat file in the sampledata/models directory named externalTexture.mat:

// Copyright 2018 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
material {
    "name" : "Chroma Key Video Material",
    "defines" : [
        "baseColor"
    ],
    "parameters" : [
        {
           // The texture displaying the frames of the video.
           "type" : "samplerExternal",
           "name" : "videoTexture"
        }
    ],
    "requires" : [
        "position",
        "uv0"
    ],
    "shadingModel" : "unlit",
    // Blending is "masked" instead of "transparent" so that the shadows account for the
    // transparent regions of the video instead of just the shape of the mesh.
    "blending" : "masked",
    // Material is double sided so that the video is visible when walking behind it.
    "doubleSided" : true
}

fragment {
    void material(inout MaterialInputs material) {
        prepareMaterial(material);

        vec2 uv = getUV0();

        if (!gl_FrontFacing) {
          uv.x = 1.0 - uv.x;
        }

        material.baseColor = texture(materialParams_videoTexture, uv).rgba;
    }
}

然后在您的 .sfa 文件中将材料源更改为 externalTexture.mat:

Then in your .sfa file change the material source to externalTexture.mat:

     source: "sampledata/models/externalTexture.mat",

这篇关于逃逸色度键颜色的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！