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Is it possible to override the texture component values even though the variable is set to public?

I have a texture issue with a VR whiteboard. When I attach a texture to a plane in Unity that has the whiteboard.cs script attached, the whiteboard plane defaults to plain white when I press run. The plane is still reactive to the marker in a VR space, but I want to be able to put up a stencil texture/material that allows users to trace it. I've seen the similar issue when the variables are private and not when set to public. Has anyone experienced the same texture GetComponent issue? I'm using Unity 2021.2,10f.
Attached is a screenshot of the object before and after pressing run and the mentioned script.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Whiteboard : MonoBehaviour
{
public Texture2D texture;
public Vector2 textureSize = new Vector2(x:2048, y:2048);
void Start()
{
var r = GetComponent<Renderer>();
texture = new Texture2D(width:(int)textureSize.x,
height:(int)textureSize.y);
r.material.mainTexture = texture;
}
}

Unity color wont assign to ball or what it should be painting

private Color solveColor;
void Start()
{
Color[] colors = { Color.cyan, Color.red, Color.green, new Color(245, 195, 29), Color.yellow, Color.magenta };
int lengthOfColors = colors.Length;
int solveColor = UnityEngine.Random.Range(0, lengthOfColors);
}
private void start()
{
GetComponent<MeshRenderer>().material.color = solveColor;
}
private void FixedUpdate()
{
// Set the balls speed when it should travel
if (isTraveling) {
rb.velocity = travelDirection * speed;
}
// Paint the ground
Collider[] hitColliders = Physics.OverlapSphere(transform.position - (Vector3.up/2), .05f);
int i = 0;
while (i < hitColliders.Length)
{
GroundPiece ground = hitColliders[i].transform.GetComponent<GroundPiece>();
if (ground && !ground.isColored)
{
ground.Colored(solveColor);
}
The above code is supposed to pick one color from the colors array and assign it to both the ball and balls painting ability (whenever the ball collides with the ground it changes its color) however the paint the ball leaves is always black and the ball itself is always orange (pretty sure the ball color is coming from its default). I can't figure out why this is happening any help is very appreciated.
Thank you for your time

In the code you provided, nowhere do you set the material color of the ball again aside from Start. If you want to have the particles behind the ball leave different colors, you will need to instantiate a new instance of the material. The reason for this is because materials in Unity are default shared between all instances of that particular material.
All of this info and a bit more can be found on the Material docs page.
As you have a fixed size of colors you are using, I would instead create 6 new materials and make an array of materials instead. Now, instead of randomly picking a color, pick a material and assign it to the ball or your new instanced painting ability. I am also confused as to why you are placing your array of colors inside of your Start function. It would be localized to that function only then. You also appear to have two Start functions, which is odd. One being the Monobehaviour Start and another start. Unless that is intended, your second start will not be run unless you call it.
Now to get to the solution I was talking about.
// assign these in the inspector to your new materials
[SerializeField] private List<Material> materials = new List<Material>();
private MeshRenderer meshRender;
private void Start()
{
meshRenderer = GetComponent<MeshRenderer>();
// set our first random Material
SetNewMaterialColor();
}
private void SetNewMaterialColor()
{
meshRenderer.material = GrabNewMaterial();
}
private void FixedUpdate()
{
// Set the balls speed when it should travel
if (isTraveling) {
rb.velocity = travelDirection * speed;
}
// Paint the ground
Collider[] hitColliders = Physics.OverlapSphere(transform.position - (Vector3.up/2), .05f);
int i = 0;
while (i < hitColliders.Length)
{
GroundPiece ground = hitColliders[i].transform.GetComponent<GroundPiece>();
if (ground && !ground.isColored)
{
// change this from a color to a material instead
ground.Colored(meshRenderer.material);
// set a new material to your main object
SetNewMaterialColor();
}
}
}
private Material GrabNewMaterial()
{
return materials[UnityEngine.Random.Range(0, materials.Count)];
}
You will need to change your Colored function to take in a Material instead of a Color. If you want the implementation to be more dynamic, you can instead create an instance of your material and set the color dynamically, but as you have a fixed size of colors I do not think you need to do that.
Edit: The one other option which involves creating a new shader would be to utilize [PerRendererData] meaning each object for a property field is rendered individually. I would go with the previous option as either option using shaders or instanced materials is a bit more complex.
You would need to use a MaterialPropertyBlock and can then assign the color when you want. It would look something like
public void SetNewColor()
{
// create a new material property block
MaterialPropertyBlock tmpBlock = new MaterialPropertyBlock();
// grab the current block from our renderer
meshRender.GetPropertyBlock(tmpBlock);
// set our changes to the block
tmpBlock.SetColor("_Color", YourColorHere);
// now apply our changes
tmpRend.SetPropertyBlock(tmpBlock);
}
And you would need to create a new shader that laters the Main Color property by using the PerRendererData attribute.
Properties
{
[PerRendererData]_Color("Main Color", Color) = (1,1,1,1)
...
Also, one other question I have is why you are using Physics.OverlapSphere instead of just an OnCollisionEnter? Or if your game is 2D, then OnCollisionEnter2D and let the physics engine handle how collisions work, then just change the colors when the collision occurs?
Edit: Here are the answer to your questions - let me know if you have more.
In the line "[SerializeField] private List materials = new
List();" which section do I need to replace with the
materials and how?
The line as is is fine. By using [SerializeField] it exposes this list to the editor. You will want to create several new duplicate materials that use your 6 different colors. Instead of setting the colors, you will be setting materials now. What I mean by inspector and editor is you can find the object that has this script on it in Unity, select it (it must be a Prefab or in the scene), then a tab of the Unity editor will populate with information about this object. Find the script portion and find the field materials. There should be a drop-down arrow, click it and set the number to 6 (or however many material swaps you want). Now create 6 new materials with your colors and drag them into the boxes that appeared.
Would it be something like writing "./Materials/Ball 1" in the () for
example?
Nope! You would be assigning this data in the inspector, so the data would be stored in the list without referencing them in code.
And I'm not sure how to assign this to my ball using "[SerializeField]
private GameObject paintObject = null;"
Similarly, this would appear in the inspector. However, remove this line as I misunderstood your original question and accidentally left this in. I assumed that your paint object was a Prefab that you were spawning after the ball bounced, not the ground that you were changing the color of.
I get the error "Argument 1: cannot convert from
'UnityEngine.Material' to 'UnityEngine.Color'"
Yep! So as I mentioned in the comments, your function call to your paint object is most likely currently taking a Color parameter. As I changed your implementation to instead directly set Material, you will need to change how that function signature. Specifically the line:
ground.Colored(meshRenderer.material);
You have some object ground that is of type GroundPiece and has a function called Colored. I assume it currently look something like:
public void Colored(Color color){...}
You want to change this instead to:
public void Colored(Material mat{...}
After changing it, instead of changing the ground's color in this script, you would change its material directly. Let me know if you have more questions.

How do I get the texture to scroll on my sprite?

I have a large sprite on my screen but I want the image it displays to scroll infinitely horizontally.
I have the current code which does not have any effect at all.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ObjLayer : MonoBehaviour
{
public float Speed = 0;
public int layer = 0;
protected Material _material;
protected float currentscroll = 0f;
// Start is called before the first frame update
void Start()
{
_material = GetComponent<SpriteRenderer>().material;
}
// Update is called once per frame
void Update()
{
currentscroll += Speed * Time.deltaTime;
var currentOffset=_material.GetTextureOffset("Layer3");
_material.SetTextureOffset("Layer3", new Vector2(currentscroll, 0));
_material.mainTextureOffset = new Vector2(currentscroll, 0);
}
}
Just to note that I am setting both SetTextureOffset and mainTextureOffset as neither seem to be working.
Also currentOffset is changing as expected but the texture is not moving on the screen.

You are most likely using a Material that doesn't support texture offsetting, unless the property is HiddenInInspector you can check in the inspector if your material supports it by checking if it has the Offset x,y input fields underneath "Texture"
The standard Unlit/Texture shader has this property, so do any newly created UnlitShaders (as seen in my example screenshot).
If you are using a custom shader then your Texture isn't named "_MainTex", which is the property that Unity looks for when using mainTextureOffset, as cited from the docs:
By default, Unity considers a texture with the property name name "_MainTex" to be the main texture.
Using material.mainTextureOffset works fine for me when using a shader where the Texture is called _MainTex:
public Vector2 offset;
private Material material;
private void Start()
{
material = GetComponent<MeshRenderer>().material;
}
private void Update()
{
material.mainTextureOffset = offset;
}
Result (Gyazo gif)
In your example
_material.SetTextureOffset("Layer3", new Vector2(currentscroll, 0));
You are looking for a property named "Layer3" in your shader, this is not a name that is standard in use by Unity (in my knowledge), if you are using a custom shader then make sure your Texture property has the name Layer3 inside your shader.
Update after OP's comment:
Tiling and Offsetting is not available to Materials on a SpriteRenderer, Sprites are assumed to not be offset. As indicted by the warning given by Unity when you try to add a material that has Tiling/Ofsetting in its texture
Material texture property _MainTex has offset/scale set. it is incompatible with spriterenderer
Instead use a Quad, Plane, Image or raw Image component which does have support for materials with tiling/offsetting in combination with the above code.
I think technically it is still possible to use offsetting with sprites by throwing on a shader that support it and ignoring the warning, but I can not guarantee this won't break down the line or what the performance implications are

Mouse over is not changing the material when hovering over game object in unity

I want to be able to hover over certain game objects and the object changes material. I cannot figure out why my game object won't change material when I hover over it. I have made sure and added the materials in the inspector. I have tried multiple ways to get it to work but still no luck. I am using unity 2018.4.16. I have tried using different examples and looked at the documentation, but alas I am stuck in the water. Any help would be very appreciated.
public Material startColor;
public Material mouseOverColor;
Renderer rend;
void OnMouseOver()
{
rend.sharedMaterial = mouseOverColor;
}
void OnMouseExit()
{
rend.sharedMaterial = startColor;
}
// Start is called before the first frame update
void Start()
{
rend = GetComponent<Renderer>();
rend.enabled = true;
rend.sharedMaterial = startColor;
}

I ended up finding a solution. I needed to add a "Rigidbody" component and then checking "Is Kinematic" in the inspector as well as adding a "mesh collider" component, and now it works for anyone who is having a similar issue.

Unity3D: Change skybox color via script?

I am working on a game in the engine Unity, and am trying to make the skybox change color based on the time of day, but I can't seem to find out how to get it working.. What I want to do, I think, is to change the color of the material I use for the skybox in render settings, and be able to set it using one variable for red, one for green and one for blue.
I am using C#.
Thanks in advance for all answers :)

From the code you displayed in the comment:
RenderSettings.skybox.SetColor("_Tint", 0, 0, blue)
I think you mean
RenderSettings.skybox.SetColor("_Tint", Color.blue)
no need for extra zeros and remember that the color "blue" is a member variable of the Color class.
Next you would have to develop a time system and based on the time var you pass to the script controlling the skybox renderer you would then use a Lerp function to smoothly transition from one color to the next... like this
using UnityEngine;
using System.Collections;
public class example : MonoBehaviour {
public Color colorStart = Color.blue;
public Color colorEnd = Color.green;
public float duration = 1.0F;
void Update() {
float lerp = Mathf.PingPong(Time.time, duration) / duration;
RenderSettings.skybox.SetColor("_Tint", Color.Lerp(colorStart, colorEnd, lerp));
}
}
Then you could write a function to change the colorStart and colorEnd...
Hope this helps...

We can change Skybox color using the _Tint property. RenderSettings is the base class used to change the render properties at run time. For ensuring the attribute is existing in the skybox is done by the HasProperty(). SetColor() is used to set the color of the skybox.
if (RenderSettings.skybox.HasProperty("_Tint"))
RenderSettings.skybox.SetColor("_Tint", Color.red);
else if (RenderSettings.skybox.HasProperty("_SkyTint"))
RenderSettings.skybox.SetColor("_SkyTint", Color.red);

you can make your own skybox too in unity by changing texture shape into a cube one then apply for those changes it will create a cube mesh which you can simply drop it into your unity editor scree.
and if you want to load multiple skybox materials on run time by click on button
I have that code for that i hope it will help you for building a project in which you want to change skybox by some time or by using other input method.
enter code here
public class skybox : MonoBehaviour {
enter code here
public Material[] secondSkybox;
public static int i = 0;
public void skyboxOn()
{
if (i == 0) {
RenderSettings.skybox = secondSkybox[0];
i++;
}
else if(i==1)
{
RenderSettings.skybox = secondSkybox[1];
i++;
}else if(i==2)
{
RenderSettings.skybox = secondSkybox[2];
i=0;
}
}
}

and if you want too change the color of skybox which can be done by using this line of code
RenderSettings.skybox.SetFloat ("_Exposure", Mathf.Sin (Time.time * Mathf.Deg2Rad * 100) + 2);