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Fix light_control example and update tutorial #2149

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merged 4 commits into from
Sep 15, 2023
Merged

Fix light_control example and update tutorial #2149

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3c70a64
Fix light control example and update tutorial
iche033 Sep 14, 2023
aba143d
minor tweak
iche033 Sep 14, 2023
754dbac
revert change
iche033 Sep 14, 2023
93151c1
merge from gz-sim8
iche033 Sep 15, 2023
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2 changes: 2 additions & 0 deletions examples/standalone/light_control/light_control.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,7 @@ void createLight()

entityFactoryRequest.mutable_light()->set_name("point");
entityFactoryRequest.mutable_light()->set_range(4);
entityFactoryRequest.mutable_light()->set_intensity(1);
entityFactoryRequest.mutable_light()->set_attenuation_linear(0.5);
entityFactoryRequest.mutable_light()->set_attenuation_constant(0.2);
entityFactoryRequest.mutable_light()->set_attenuation_quadratic(0.01);
Expand Down Expand Up @@ -149,6 +150,7 @@ int main(int argc, char **argv)
//! [modify light]
lightRequest.set_name("point");
lightRequest.set_range(4);
lightRequest.set_intensity(1);
lightRequest.set_attenuation_linear(0.5);
lightRequest.set_attenuation_constant(0.2);
lightRequest.set_attenuation_quadratic(0.01);
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9 changes: 6 additions & 3 deletions tutorials/light_config.md
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Expand Up @@ -7,17 +7,20 @@ This service will allow to modify lights in the scene.

To modify lights inside the scene we need to use the service `/world/<world name>/light_config` and
fill the message [`gz::msgs::Light`](https://gazebosim.org/api/msgs/9/classgz_1_1msgs_1_1Light.html).
In particular this example modifies the point light that we introduced with the function `createLight()`.

This tutorial describes the code in the `examples/standalone/light_control` example.

First we create a point light with the function `createLight()`:

\snippet examples/standalone/light_control/light_control.cc create light

**NOTE:**: You can check the [entity creation](entity_creation.html) tutorial to learn how to include models and lights in the scene.

As you can see in the snippet we modify the specular and diffuse colors of the light in the scene.
As you can see in the snippet below, we then modify the specular and diffuse colors of the point light in the scene.

\snippet examples/standalone/light_control/light_control.cc modify light

In this case we are creating random numbers to fill the diffuse and specular.
The `r`, `g`, `b` components of the light diffuse and specular colors are randomly generated and constantly changing:

\snippet examples/standalone/light_control/light_control.cc random numbers

Expand Down